#include <algorithm>
#include <cfloat>
#include <climits>
#include <cmath>
#include <complex>
#include <cstdio>
#include <cstdlib>
#include <cstring>
#include <functional>
#include <iostream>
#include <map>
#include <memory>
#include <queue>
#include <set>
#include <sstream>
#include <stack>
#include <string>
#include <utility>
#include <vector>
 
using namespace std;
 
#define sz size()
#define pb push_back
#define mp make_pair
#define fi first
#define se second
#define all(c) (c).begin(), (c).end()
#define rep(i,a,b) for(int i=(a);i<(b);++i)
#define clr(a, b) memset((a), (b) ,sizeof(a))
 
#define MOD 1000000009
 
int main(){
  int d[3];
  cin>>d[0]>>d[1]>>d[2];
  sort(d,d+3);
  int ans = d[0];
  d[1] -= d[0];
  d[2] -= d[0];
  int mx = 0;
  rep(i,0,10000001){
    int a = d[1];
    int b = d[2];
    if(a>=i&&b>=i*3){
      a-=i;
      b-=i*3;
    }
    else{
      break;
    }
    int c = min(a/3,b);
    a -= 3*c;
    b -= c;
    mx = max(mx,i+c+a/5+b/5);
  }
  cout << ans+mx << endl;
  return 0;
}