Kertoma

const readline = require('readline').createInterface({
    input: process.stdin,
});

let pi = Math.PI;
let ln = Math.log;

async function prompt(question) {
    return new Promise((resolve, reject) => {
        readline.question(question, input => {
            resolve(input);
        });
    });
}

function lengthoffactorial(n) {
    return Math.floor((ln(2*pi*n)/2+n*(ln(n)-1))/ln(10))+1
}

async function main() {
    let input = await prompt("");
    let sum = input.split(" ").reduce((a, b) => parseInt(a) + parseInt(b), 0);
    let i = 2
    while (true) {
        if (lengthoffactorial(i) == sum) {
            console.log(i)
            break
        }
        i++
    }
    process.exit();
}

main()

Test 1

Group: 1, 2, 3

Verdict: ACCEPTED

Test 2

Group: 1, 2, 3

Verdict: WRONG ANSWER

Test 3

Group: 1, 2, 3

Verdict: ACCEPTED

Test 4

Group: 1, 2, 3

Verdict: ACCEPTED

Test 5

Group: 1, 2, 3

Verdict: ACCEPTED

Test 6

Group: 1, 2, 3

Verdict: ACCEPTED

Test 7

Group: 2, 3

Verdict: ACCEPTED

Test 8

Group: 2, 3

Verdict: ACCEPTED

Test 9

Group: 2, 3

Verdict: ACCEPTED

Test 10

Group: 2, 3

Verdict: ACCEPTED

Test 11

Group: 3

Verdict: ACCEPTED

Test 12

Group: 3

Verdict: ACCEPTED

Test 13

Group: 3

Verdict: ACCEPTED

Test 14

Group: 3

Verdict: ACCEPTED

Test 15

Group: 3

Verdict: ACCEPTED

Test 16

Group: 3

Verdict: ACCEPTED