#include <bits/stdc++.h>
using namespace std;
#define REP(i, n)           for(int(i)=0;(i)<(n);++(i))

int main(){
    int r,g,b;
    cin >>r>>g>>b;

    int c = min(min(r,g),b);
    r -= c;
    g -= c;
    b -= c;
    int a[3];
    a[0] = r, a[1] = g, a[2] = b;
    sort(a,a+3);

    while(a[1] > 0 && a[2] > 2){
        c++;
        a[1]--;
        a[2]-=3;
        sort(a,a+3);
    }
    if(a[1] == 0 && a[2] > 4){
        c += a[2]/5;
    }

    cout << c << endl;
    return 0;
}