#include<iostream>
#include<fstream>
using namespace std;

int numar(long long n)
{int a, s=0;
while(n!=0)
    {  a=n%10;
        if(a%5==0)
        { 
            s=s+a;
            
        }
         n=n/10;
    }
    cout<<s;
}
int main()
{
long long n;
ifstream f("numar.in");
f>>n;
numar(n);
}