diff --git a/.gitignore b/.gitignore
index 442d623..7b502b7 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,4 +1,5 @@
 .idea
 dist
 node_modules
-configs/deploy/sftp-config.js
+.gitignore
+configs
diff --git a/src/components/table/Table.ts b/src/components/table/Table.ts
index 40653c1..44cfdd0 100644
--- a/src/components/table/Table.ts
+++ b/src/components/table/Table.ts
@@ -1,6 +1,7 @@
 import { initialStyleState } from '../../constants';
 import { $, Dom } from '../../core/dom';
 import { ExcelComponent } from '../../core/ExcelComponent';
+import { parse } from '../../core/parse';
 import { changeCurrentStyles } from '../../redux/actions';
 import * as actions from '../../redux/actions';
 import { resizeHandler } from './handlers/table.resize';
@@ -35,10 +36,11 @@ export class Table extends ExcelComponent {
     const $cell = this.$root.find('[data-id="0:0"]');
     this.selection.select($cell);
 
-    this.$emit('table:select-cell', $cell.text);
+    this.$emit('table:select-cell', $cell.data.value);
 
     this.$on('formula:input', (data) => {
-      this.selection.current.text = data;
+      this.selection.current.attr('data-value', data);
+      this.selection.current.text = parse(data);
       this.updateCurrentTextInStore(data);
     });
 
@@ -73,6 +75,7 @@ export class Table extends ExcelComponent {
       const cols = this.$root.findAll(`[data-col="${key}"]`);
       cols.forEach(el => $(el as HTMLElement).css({ width: `${size.col[key]}px` }));
     });
+
     Object.keys(size.row).forEach(key => {
       const rows = this.$root.findAll(`[data-row="${key}"]`);
       rows.forEach(el => $(el as HTMLElement).css({ height: `${size.row[key]}px` }));
@@ -88,13 +91,14 @@ export class Table extends ExcelComponent {
       const $cell = this.$root.find(`[data-id="${cellId}"]`);
       const styles = tableStyles[cellId];
 
-      $cell.text = tableContent[cellId] || '';
+      $cell.text = parse(tableContent[cellId]) || '';
+      $cell.setData('value', tableContent[cellId]);
       $cell.css(styles);
     });
   }
 
   emitSelectCallback() {
-    this.$emit('table:select-cell', this.selection.current.text);
+    this.$emit('table:select-cell', this.selection.current.data.value);
 
     const styles = this.selection.current?.getStyles(Object.keys(initialStyleState) as (keyof Partial<CSSStyleDeclaration>)[]);
     this.$dispatch(changeCurrentStyles(styles));
diff --git a/src/constants.ts b/src/constants.ts
index b28c754..854ad10 100644
--- a/src/constants.ts
+++ b/src/constants.ts
@@ -16,5 +16,5 @@ export const initialState: StateType = {
   stylesState: {},
   title: 'New excel table',
   ...storage('excel-state'),
-  currentStyles: { ...storage('excel-state').stylesState['0:0'] },
+  currentStyles: { ...storage('excel-state')?.stylesState?.['0:0'] },
 };
diff --git a/src/core/dom.ts b/src/core/dom.ts
index cda9284..a1370e0 100644
--- a/src/core/dom.ts
+++ b/src/core/dom.ts
@@ -72,6 +72,10 @@ export class Dom implements DomClass {
     return this.$el.dataset;
   }
 
+  setData(name: string, value: string) {
+    this.$el.setAttribute(`data-${name}`, value);
+  }
+
   closest(selector: string) {
     return $(this.$el.closest(selector) as HTMLElement);
   }
@@ -110,6 +114,15 @@ export class Dom implements DomClass {
       return res;
     }, {});
   }
+
+  attr(name: string, value: string) {
+    if (value) {
+      this.$el.setAttribute(name, value);
+      return this;
+    }
+
+    return this.$el.getAttribute(name);
+  }
 }
 
 export function $(selector: SelectorType) {
diff --git a/src/core/parse.ts b/src/core/parse.ts
new file mode 100644
index 0000000..3b95b08
--- /dev/null
+++ b/src/core/parse.ts
@@ -0,0 +1,12 @@
+export function parse(value: string) {
+  if (value.startsWith('=')) {
+    try {
+      // eslint-disable-next-line no-eval
+      return eval(value.slice(1));
+    } catch (e) {
+      return value;
+    }
+  }
+
+  return value;
+}
diff --git a/src/core/utils.ts b/src/core/utils.ts
index 2e37cca..128fa08 100644
--- a/src/core/utils.ts
+++ b/src/core/utils.ts
@@ -19,3 +19,17 @@ export function isEqual(a: any, b: any) {
 
   return a === b;
 }
+
+export function debounce(fn: (fnArgs?: any) => void, wait: number) {
+  let timeout: NodeJS.Timeout;
+
+  return function (...args: any[]) {
+    const later = () => {
+      clearTimeout(timeout);
+      fn.apply(this, args);
+    };
+
+    clearTimeout(timeout);
+    timeout = setTimeout(later, wait);
+  };
+}
diff --git a/src/index.ts b/src/index.ts
index 2660e7f..6875c68 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -5,14 +5,17 @@ import { Table } from './components/table/Table';
 import { Toolbar } from './components/toolbar/Toolbar';
 import './styles/index.scss';
 import { Store } from './core/createStore';
-import { storage } from './core/utils';
+import { debounce, storage } from './core/utils';
 import { rootReducer } from './redux/rootReducer';
+import { StateType } from './redux/types';
 
 const store = new Store(rootReducer);
 
-store.subscribe(state => {
+const stateListener = debounce((state: StateType) => {
   storage('excel-state', state);
-});
+}, 300);
+
+store.subscribe(stateListener);
 
 const excel = new Excel('#app', {
   components: [Header, Toolbar, Formula, Table],