#include <iostream>
using namespace std;
int a,b,c,d;
int main()
{
cin >> a;
cin >> b;
cin >> c;
cin >> d;
if(a%5 == 0)
{
if(a<b && a<c && a<d)
cout << a << endl;
}
if(b%5 == 0)
{
if(b<a && b<c && b<d)
cout << b << endl;
}
if(c%5 == 0)
{
if(c<b && c<a && c<d)
cout << c << endl;
}
if(d%5 == 0)
{
if(d<b && d<c && d<a)
cout << d << endl;
}
return 0;
}