Kertoma

var r = require("readline").createInterface({
    input: process.stdin,
    output: process.stdout,
    terminal: false
});
 
async function prompt(question) {
    return new Promise((resolve, reject) => {
        r.once('line', (line) => {
            resolve(line);
        });
    });
}

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