function main(input = ``) {
  let lines = input.split('\n');

  let nums = lines[0].split(' ').map((val) => parseInt(val));

  return (
    55 -
    nums.reduce((sum, i) => {
      return sum + i;
    }, 0)
  );
}

const { readFileSync, existsSync } = require('fs');
const stdin = '/dev/stdin';

if (existsSync(stdin)) {
  const input = readFileSync(stdin, 'utf8');
  console.log(main(input));
}

module.exports = main;