#include<bits/stdc++.h>

using namespace std;
using ll=long long;
#define rep2(i, a, n) for(int i = (a); i < (n); i++)
#define rep(i, n) rep2(i,0,n)

int main(){
  cin.tie(nullptr);ios_base::sync_with_stdio(false);
  int w,b,r,cnt=0;cin>>w>>b>>r;
  if(b>r){
    cnt+=r;
    b-=r;
    if(w>b){
      cnt+=w-b;
      w-=b;
    }
  }else{
    cnt+=b;
    r-=b;
    if(w>r){
      cnt+=w-r;
      w-=r;
    }
  }
  cnt+=w/2;
  cout<<cnt<<endl;
}