let input = [
    '2346',
];

let print = this.print || console.log;
let gets = this.gets || ((arr, index) => () => arr[index++])(input, 0);

let inputOne = +gets();

let fourthDigit = inputOne % 10;
input = Math.floor(input / 10);

let thirdDigit = input % 10;
input = Math.floor(input / 10);

let secondDigit = input % 10;
input = Math.floor(input / 10);

let firstDigit = input % 10;
input = Math.floor(input / 10);

let sum = firstDigit + secondDigit + thirdDigit + fourthDigit;
console.log(sum);