#include<bits/stdc++.h>

using namespace std;

using int64 = long long;

int main() {
  int N, M, K;
  cin >> N >> M >> K;

  auto make = [](int N, int M, int K, bool f) -> string {
    string Z=f?"0":"1";
    if(f)--N;else --M;
    while (K > 0) {
      if (f) {
        --M;
        Z += "1";
      } else {
        --N;
        Z += "0";
      }
      f ^= 1;
      if (N < 0 or M < 0) {
        return "inf";
      }
      --K;
    }
    string ushi;
    for(auto& c : Z) {
      if (c == '0') {
        while (N > 0) {
          ushi += "0";
          --N;
        }
      }
      ushi += c;
    }
    string uku;
    for(int i = (int) ushi.size() - 1; i >= 0; i--) {
      if (ushi[i] == '1') {
        while (M > 0) {
          uku += "1";
          --M;
        }
      }
      uku += ushi[i];
    }
    reverse(uku.begin(), uku.end());
    if(N > 0 or M > 0) return "inf";
    return uku;
  };
  auto p = make(N, M, K,false);
  auto q = make(N, M, K,true);
  p = min(p, q);
  if(p == "inf") cout << -1 << endl;
  else cout << p << endl;
}