#define _USE_MATH_DEFINES

#include <iostream>
#include <iomanip>

#include <algorithm>
#include <cmath>

#include <string>
#include <list>
#include <queue>
#include <vector>
#include <complex>

/////////
#define REP(i, x, n) for(int i = x; i < n; i++)
#define rep(i,n) REP(i,0,n)
#define P(p) std::cout<<(p)<<std::endl;
/////////
typedef long long LL;
typedef long double LD;
/////////
using namespace::std;
/////////

int main(void){
    std::cin.tie(0);
    std::ios::sync_with_stdio(false);
    std::cout << std::fixed;//
    //cout << setprecision(6);//
	
	int C[3];
	rep(i,3)cin>>C[i];
	sort(C,C+3);
	int ans = 0;
	ans += C[0];
	C[1] -= C[0];
	C[2] -= C[0];
	C[0] -= C[0];
	//0,A<=B
	
	if(3*C[1] <= C[2]){
		ans += C[1];
		C[2] -= 3*C[1];
		C[1] -= C[1];

		ans += C[2]/5;
		P(ans);
		return 0;
	}

	int dif = C[2] -C[1];
	ans += dif/2;
	C[1] -= dif/2;
	C[2] -= 3*(dif/2);

	ans += 2*(C[1]/4);
	C[2] -= 4*(C[1]/4);
	C[1] -= 4*(C[1]/4);
	if(C[2] >= 3){
		++ans;
	}
	P(ans);
	return 0;
}