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#include <iostream>
#include <fstream>
using namespace std;
ifstream f("fact.in");
ofstream g("fact.out");
int v[5],s[5];
long long n=1;
int main()
{ int i=0,P,x;
f>>P;
v[5]=P;
if (P==0) g<<1;
else
while (i!=1)
{
i+=5;
x=i;
while(x!=0)
{
if (x%5==0)
{
s[5]+=1; if(s[5]==v[5]) {n=x; x=0; i=1;} }
x=x/5;
}
}
g<<n;
return 0;
}