#include <bits/stdc++.h>
using namespace std;
template<typename type>
void vector_sort(vector<type>& v,function<int(type)> fn=[](int a){return a;},int decided=0){
    int range=v.size()-decided;
    if(range==0){
        return;
    }
    int parent=(v.size()-decided-1)/2;
    int child=parent*2+1;
    int parent_depth=1;
    while(pow(2,parent_depth)-1<range){
        parent_depth++;
    }
    parent_depth-=2;
    type temp;
    while(parent_depth>=0){
        for(int i=pow(2,parent_depth)-1;i<pow(2,parent_depth+1)-1;i++){
            if(i*2+1<range && fn(v[i])<fn(v[i*2+1])){
                temp=v[i];
                v[i]=v[i*2+1];
                v[i*2+1]=temp;
            }
            if(i*2+2<range && fn(v[i])<fn(v[i*2+2])){
                temp=v[i];
                v[i]=v[i*2+2];
                v[i*2+2]=temp;
            }
        }
        parent_depth--;
    }
    temp=v[0];
    v[0]=v[range-1];
    v[range-1]=temp;
    vector_sort(v,fn,decided+1);
}

int main(){
    vector<int> num(3);
    cin>>num[0]>>num[1]>>num[2];
    vector_sort(num);
    int answer=0;
    num[1]-=num[0];
    num[2]-=num[0];
    answer+=num[0];
    num[0]=0;
    if(num[1]*3<=num[2]){
        answer+=num[1];
        num[2]-=num[1]*3;
        answer+=num[2]/5;
    }else{
        answer+=num[2]/3;
    }
    cout<<answer<<endl;
}