#include<iostream.h>
#include<fstream.h>
ifstream f("fact.in");
ofstream g("fact.out");
unsigned long v=0;
int p,nr=0,i,x=0;
void fact(int n)
		{int i;
		unsigned long y=1;
		for(i=1;i<=n;i++)y*=i;
		v=y;
		}
int main()
{f>>p;
x=0;
while(nr!=p)
		{fact(x);i=10;
		while(v%i==0){nr++;
						i*=10;
						}
		if(nr==p)break;
		else
			{ x++;nr=0;
			}
					 }
g<<v;
g.close();
f.close();
return 0;
}