#include <bits/stdc++.h>
using namespace std;

signed main(){
  int R, G, B; cin >> R >> G >> B;
  int ans = min( { R, G, B } );
  R -= ans, G -= ans, B -= ans;
  int v[ 3 ] = { R, G, B }; sort( v, v + 3 );
  if( R + G > 0 and G + B > 0 and R + B > 0 ){
    int lb = 0, rb = ( int ) 1e7;
    int z = 0;
    while( lb <= rb ){
      int mid = lb + rb >> 1;
      int ok = 0;
      for( int i = 0; i <= mid; ++i ){
        if( v[ 1 ] - 2 * i < mid )
          break;
        if( v[ 2 ] - 2 * ( mid - i ) >= mid )
          ok = 1;
      }
      if( ok )
        z = mid, lb = mid + 1;
      else
        rb = mid - 1;
    }
    ans += z;
    for( int i = 0; i <= z; ++i ){
      if( v[ 1 ] - 2 * i < z )
        break;
      if( v[ 2 ] - 2 * ( z - i ) >= z ){
        v[ 1 ] -= 2 * i + z, v[ 2 ] -= 2 * ( z - i ) + z;
      }
    }
  }
  ans += max( { v[ 0 ], v[ 1 ], v[ 2 ] } ) / 5;
  cout << ans << endl;
  return 0;
}