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#include <iostream>
#include <fstream>
using namespace std;
ifstream in("fact.in");
ofstream out("fact.out");
int fn(int n)
{
for(int i=1;i<=n;++i)
if(n+1==i*6)
return 1;
return 0;
}
int fact(int n)
{
int r=fn(n);
if(n>0&&r==0)
{
int k,c=0,p=0,q=1,o=0;
c=n*5;
p=c/25;
return c-p*5;
}
//else if(n==0)
// return 1;
//else if(n<0||n>100000000||r==1)
// return -1;
}
int main()
{
int n;
in>>n;
in.close();
out<<fact(n);
out.close();
return 0;
}