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

int main(){
    int a[3];
    REP(i,3) cin >> a[i];
    int c = min(min(a[0],a[1]),a[2]);
    REP(i,3) a[i] -= c;
    sort(a,a+3);
    while(a[1] > 0 && a[2] > 2){
        int k = min(a[1],a[2]/3);
        a[1]-=k;
        a[2]-=k*3;
        c += k;
        sort(a,a+3);
    }
    if(a[1] == 0 && a[2] > 4){
        c += a[2]/5;
    }
    cout << c << endl;
    return 0;
}