#include <iostream>
#include <fstream>

using namespace std;

ifstream fin("fact.in");
ofstream fout("fact.out");

int n, p;

int main(){
	int i, pz;
	fin >> p;
	if((25 * (p + 1) / 6) % 25 == 0) cout << -1;
	else
		fout << (int)(25.0 * p / 6 + 4.99999) / 5 * 5;
}