#include<iostream>
using namespace std;
int main(){
    try{
        int num, fact = 1;
        cin>>num;
        if(num<=0){
            throw "Invalid input";
        }
        else if(num<1||num>12){
            throw "Overflow occurred";
        }
        else{
            for(int i = 1;i<(num+1);i++){
                fact*=1;
            }
        }
        cout<<fact;
    }
    catch(const char* msg){
        cout<<msg
    }
}