#include <bits/stdc++.h>
using namespace std;
#define int long long
#define INF (int)1e18
#define f first
#define s second

mt19937_64 RNG(chrono::steady_clock::now().time_since_epoch().count());

void Solve() 
{
    int n, m, k;
    cin>>n>>m>>k;
    
    if (k==0){
        if (n==0){
            while (m--){
                cout<<1;
            }
            return;
        } else if (m==0) {
            while (n--){
                cout<<0;
            }
            return;
        } else {
            cout<<-1<<"\n";
            return;
        }
    }
    
    int mx = (n==m)? n + m - 1 : min(n, m) * 2;
    
    if (k>mx || k<1) {
        cout<<-1<<"\n";
        return;
    }
    
    if (k == 2 * n && n!=m){
        for (int i=1; i<=n; i++){
            cout<<"10";
            m--;
        }
        while (m--)
        cout<<1;
        return;
    }
    
    if (k%2==1){
        int use = (k+1)/2;
        n-= use;
        for (int i=0; i<n; i++) cout<<0;
        for (int i=1; i<=use; i++){
        cout<<"01";
        m--;
        }
        
        while (m--){
            cout<<1;
        }
        return;
    } else {
        int use = (k/2);
        n-=use + 1;
        for (int i=0; i<n; i++) cout<<0;
        for (int i=1; i<=use; i++){
            cout<<"01";
            m--;
        }
        while (m--) cout<<1;
        cout<<0;
        return;
    }
}

int32_t main() 
{
    auto begin = std::chrono::high_resolution_clock::now();
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    int t = 1;
  //  cin >> t;
    for(int i = 1; i <= t; i++) 
    {
        //cout << "Case #" << i << ": ";
        Solve();
    }
    auto end = std::chrono::high_resolution_clock::now();
    auto elapsed = std::chrono::duration_cast<std::chrono::nanoseconds>(end - begin);
    cerr << "Time measured: " << elapsed.count() * 1e-9 << " seconds.\n"; 
    return 0;
}