XYZ007

const readline = require("readline");

const rl = readline.createInterface({
  input: process.stdin,
  output: process.stdout,
});

let sum = 0;
let counterClose = 0;

rl.on("close", () => {
  console.log(sum);
});

rl.on("line", (input) => {
  const num = parseInt(input);
  sum += num;
  counterClose++;

  if (counterClose >= 2) {
    rl.close();
  }
});