#include<iostream>
#include<vector>
using namespace std;
using ll=long long;
#define rep(i,n) for(int i=0;i<n;i++)
#define rrep(i,n) for(int i=(n)-1;i>=0;i--)
#define all(v) v.begin(),v.end()
#define rall(v) v.rbegin(),v.rend()
template<class T> bool chmax(T &a, T b){if (a < b){a = b;return true;} else return false;}
template<class T> bool chmin(T &a, T b){if (a > b){a = b;return true;} else return false;}

int main(){
    ios::sync_with_stdio(false);
    cin.tie(nullptr);
    int n,m,k;
    cin>>n>>m>>k;
    if(n>=k/2+1&&m>=(k+1)/2){
        string s="";
        rep(i,k+1){
            if(i%2==0){
                s+='0';
                n--;
            }else{
                s+='1';
                m--;
            }
        }
        rep(i,n)s='0'+s;
        if(s.back()=='0'){
            s.pop_back();
            rep(i,m)s+='1';
            s+='0';
        }else{
            rep(i,m)s+='1';
        }
        cout<<s<<"\n";
    }else if(n>=(k+1)/2&&m>=k/2+1){
        rep(i,k+1){
            if(i%2==0){
                cout<<1;
                m--;
            }
            else cout<<0;
        }
        rep(i,m)cout<<1;
        cout<<"\n";
    }else{
        cout<<-1<<"\n";
    }
}