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#include <iostream>
#include <fstream>
using namespace std;
ifstream fin("fractii.in");
ofstream fout("fractii.out");
int fact(int n)
{
if(n==0) return 1;
else return n*fact(n-1);
}
int main ()
{
int p,i,n,x,nr;
fin>>p;
i=0;
while(p)
{
n=fact(i);
x=n;
nr=0;
while(n)
{
if(n%10==0 && n/10%10==0)
nr++;
if(n%10==0 && n/10%10!=0)
nr++;
if (n/10%10!=0) break;
n/=10;
}
if(nr==p)
{fout<<x;break;}
i++;
}
}