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Contract3.sol

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.12;

contract Contract3 {
    uint constant c1 = 10;

    constructor() {}

    function getSum(uint _v) public returns (uint){
        return c1 + _v;
    }
}

contract Contract4 {
    uint v1;

    constructor(uint _v) {
        v1=_v;
    }

    function getSum(uint _v) public returns (uint) {
        return v1 + _v;
    }
}

contract Contract5 {
    uint immutable i1;

    constructor(uint _v) {
        i1=_v;
    }

    function getSum(uint _v) public returns (uint) {
        return i1 + _v;
    }
}