ارسال شماره 1,007

const fs = require("fs");

const input = fs.readFileSync(0, "utf8").trim().split(/\s+/).map(Number);

const x = +input[0];
const y = +input[1];
const z = +input[2];


const sum = x + y + z;
const floorAvg = Math.floor(sum / 3);

console.log(floorAvg)