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contracts...SimpleBank.sol

// SPDX-License-Identifier: GPL-3.0
pragma solidity >=0.7.0 <0.9.0;

contract SimpleBank {
    
    uint public balance;
    
    constructor() {
        balance = 20000;
    }
    
    function saving(uint deposit) public {
        balance = balance + deposit;
    }
    
}