#define  _CRT_SECURE_NO_WARNINGS
#include <stdio.h>
#include <algorithm>
#include <utility>
#include <functional>
#include <cstring>
#include <queue>
#include <stack>
#include <math.h>
#include <iterator>
#include <vector>
#include <string>
#include <set>
#include <math.h>
#include <iostream> 
#include<map>
#include <iomanip>
#include <time.h>
#include <random>
#include <stdlib.h>
#include <list>
#include <typeinfo>
#include <list>
#include <set>
using namespace std;
#define LONG_INF 10000000000000000
#define MAX_MOD 1000000007
#define REP(i,n) for(long long i = 0;i < n;++i)
int main() {
	long long a, b, c;
	cin >> a >> b >> c;
	long long ans = min(a,min(b, c));
	a -= ans;
	b -= ans;
	c -= ans;
	if (a > b) {
		swap(a, b);
	}
	if (b > c) {
		swap(b, c);
	}
	if (a > b) {
		swap(a, b);
	}
	if (b > c) {
		swap(b, c);
	}
	long long pre_ans = 0;
	for (int i = 0;i < b+1;++i) {
		long long hogee = i;
		long long copy_b = b, copy_c = c;
		copy_b -= hogee;
		copy_c -= 3 * hogee;
		if (copy_b < 0 || copy_c < 0) break;
		for (int q = 0;q < copy_c+1;++q) {
			long long copye_b = copy_b, copye_c = copy_c;
			copye_b -= 3 * q;
			copye_c -= q;
			if (copye_b < 0 || copye_c < 0) break;
			pre_ans = max(pre_ans, (i + q + copye_c / 5 + copye_b / 5));
		}
	}
	cout << pre_ans + ans << endl;
	return 0;
}