#define _USE_MATH_DEFINES
#include<stdio.h>
#include<string>
#include<iostream>
#include<cctype>
#include<cstdio>
#include<vector>
#include<stack>
#include<queue>
#include <algorithm>
#include<math.h>
#include<set>
#include<map>
#include<iomanip>

//#include<bits/stdc++.h>



using namespace std;




int main() {
	int a[3]={};
	cin>>a[0]>>a[1]>>a[2];
	long long int r=0;
	sort(a,a+3);
	
		int d=min(a[0],min(a[1],a[2]));
		r+=d;
		a[0]-=d,a[1]-=d,a[2]-=d;
		//cout<<a[1]<<a[1]<<a[2]<<endl;;
			while(a[1]>0&&a[2]>2){
				//d=min(a[1],a[2]/3);
				////r+=d;
			//	if(!d)break;
				r+=1;
				a[1]-=1,a[2]-=3;
			//cout<<a[1]<<a[1]<<a[2]<<endl;;
			if(a[1]>a[2])swap(a[1],a[2]);
			}
		//	cout<<a[1]<<a[2]<<endl;
		
			if(a[2]){
				r+=a[2]/5;
			}
		
		cout<<r<<endl;

	
	
	return 0;
}