#include<iostream>
using namespace std;
int main(){
    int n;
    cin>>n;
    if (n<=0){
        cout<<"Invalid input";
    }
    else if(n>12){
        cout<<"Overflow occured";
    }
    else{
        long long fact=1;
        for(inti=1;i<=n;i++){
            fact *=1;
        }
        cout<<fact;
    }
    return 0;
}