08. Strong Number

#include <iostream>
#include <string>

using namespace std;

int main() {
    string strong;
    cin >> strong;

    int number = stoi(strong), sum = 0;

    for (int i = 1; i <= strong.length(); i++) {
        int factorial = 1;
        for (int j = 1; j <= number % 10; j++) {
            factorial *= j;
        }
        sum += factorial;
        number /= 10;
    }

    cout << (stoi(strong) == sum ? "yes" : "no") << endl;
    return 0;
}