#include <iostream>
#include <fstream>

using namespace std;

int main()
{
ifstream fin("fact.in");
ofstream fout("fact.out");
int p,n,x,factorial=1,cifre=0,factorial2=0;

fin>>p;
n=1;

while(cifre!=p){
factorial=1;
cifre=0;
for(int i=1;i<=n;++i){
        factorial=factorial*i;
}
 factorial2=factorial;
while(factorial>0){
        factorial=factorial/10;
++cifre;}
++n;

}
fout<<factorial2;

}