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#include <iostream>
#include <cmath>
#include <fstream>
using namespace std;
fstream fin("fact.in");
ofstream fout("fact.out");
int main(){
int P,N=0,i,j,ok=0,nr,nrcifzero;
cin >> P;
nrcifzero=pow(10,P);
for(i=1;i<=100 && ok==0;i++){
nr=1;
for(j=1;j<=i;j++)
nr=nr*j;
if(nr%nrcifzero==0){
ok=1;
N=i;
}
}
cout << N;
}