suma37

#include <bits/stdc++.h>
using namespace std;

int main()
{
    unsigned int n,c,s=0;
    cin>>n;
    while(n)
    {
        c=n%10;
        if(c>=3&&c<=7)
            s+=c;
        n/=10;
    }
    cout<<s<<'\n';
    return 0;
}