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#include <iostream>
#include <fstream>
using namespace std;
int cif_zero(int p) {
int j,i,d=0;
for (i=5;i<=p;i++) {
j = i;
while (j%5==0) {
j/=5;
d++;
}
}
return d;
}
int main() {
long int p;
long int i=5;
ifstream f("fact.in");
f>>p;
f.close();
while (cif_zero(i)<p)
i+=5;
ofstream g("fact.out");
if (p==0)
g<<1;
else
g<<i;
g.close();
return 0;
}