#include <iostream>

int main() {
    long a,b;
    std::cin >> a >> b;
    long ans=1;
    if (a>=b) std::cout << 0 << std::endl;
    else {
        for (int i=a;i>0;i--) {
            ans*=i;
            ans%=b;
        }
        std::cout << ans << std::endl;
    }
}