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

using Int = long long;
const char newl = '\n';

template<typename T1,typename T2> inline void chmin(T1 &a,T2 b){if(a>b) a=b;}
template<typename T1,typename T2> inline void chmax(T1 &a,T2 b){if(a<b) a=b;}
template<typename T> void drop(const T &x){cout<<x<<endl;exit(0);}
template<typename T=Int>
vector<T> read(size_t n){
  vector<T> ts(n);
  for(size_t i=0;i<n;i++) cin>>ts[i];
  return ts;
}

//INSERT ABOVE HERE
signed main(){
  cin.tie(0);
  ios::sync_with_stdio(0);

  auto valid=[&](Int n,Int m,Int p,Int k)->Int{
    if(n+m==0) return k==0;
    if(n==0) return k==(p!=1); // all 1
    if(m==0) return k==(p!=0); // all 0
    if(n+m<k) return 0;
    if(k==0) return 0;
    if(n==m) return k<=n+m;
    if(n<m){
      return k<=2*n+(p==0);
    }else{
      return k<=2*n+(p==1);
    }
  };

  Int n,m,k;
  cin>>n>>m>>k;
  if(!(valid(n-1,m,0,k) or valid(n,m-1,1,k))) drop(-1);

  Int p=2;
  while(n+m){
    //cerr<<n<<' '<<m<<' '<<k<<':'<<p<<endl;
    if(n>0 and valid(n-1,m,0,k-(p==1))){
      cout<<0;
      //cout<<flush;
      n--;
      k-=(p==1);
      p=0;
      continue;
    }
    if(m>0 and valid(n,m-1,1,k-(p==0))){
      cout<<1;
      //cout<<flush;
      m--;
      k-=(p==0);
      p=1;
      continue;
    }
    abort();
  }
  cout<<endl;
  return 0;
}