#include <iostream>

using namespace std;

int main(void) {
    bool found = false;
    int c = 0;
    while (!found) {
        c++;
        found = true;
        for (int n = 1; n < 21; n++) {
            if (c % n != 0) {
                found = false;
            }
        }
    }
    cout << c << "\n";
    return 0;
}