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#include <iostream>
#include <fstream>
using namespace std;
ifstream f("fact.in");
ofstream g("fact.out");
long long de0(long long nr){
if(nr == 0) return 1;
int cate=0;
while(nr %10 == 0){
cate ++;
nr/=10;
}
return cate;
}
int main()
{
long long cate=0;
long long n,nr;
f >> n;
if(n){
nr=0;
for(;cate<n;){
nr+=5;
if(nr % 10) cate+=1;
else cate+=de0(nr);
}
}
else nr=1;
g << nr;
return 0;
}