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#include <iostream>
#include <fstream>
using namespace std;
ifstream fin("fact.in");
ofstream fout("fact.out");
int main()
{
int n, num = 0, cnt = 1;
fin >> n;
//cin >> n;
for(int i = 0; i < 2000000000; i ++)
{
if(cnt % 5 == 0)
num ++;
if(cnt % 25 == 0)
num ++;
if(cnt % 125 == 0)
num ++;
if(cnt % 625 == 0)
num ++;
if(cnt % 3125 == 0)
num ++;
if(cnt % 15625 == 0)
num ++;
if(cnt % 78125 == 0)
num ++;
if(cnt % 390625 == 0)
num ++;
if(cnt % 1953125 == 0)
num ++;
if(cnt % 9765625 == 0)
num ++;
if(cnt % 48828125 == 0)
num ++;
if(cnt % 244140625 == 0)
num ++;
if(cnt % 1220703125 == 0)
num ++;
if(num >= n)
break;
cnt ++;
}
fout << cnt;
//cout << cnt;
}