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

bool is_ok(string S,int K,int N,int M){
    int n=S.size();
    for(int i=0;i<n-1;i++)if(S[i]!=S[i+1])K--;
    for(int i=0;i<n;i++)(S[i]=='0'?N:M)--;
    return (K==0&&N==0&&M==0);
}

int main() {

    cin.tie(nullptr);
    ios::sync_with_stdio(false);

    int N,M,K;
    cin>>N>>M>>K;
    string AN="3";
    {
        string S="";
        int USN=(K+1)/2+(1-K%2);
        int USM=(K+1)/2;
        for(int j=0;j<N-USN;j++)S.push_back('0');
        for(int i=0;i<(K+1)/2;i++){
            S+="01";
        }
        for(int j=0;j<M-USM;j++)S.push_back('1');
        if(K%2==0)S+="0";
        
        if(is_ok(S,K,N,M)){
            AN=min(AN,S);
        }
    }

    {
        string S="";
        int USN=(K+1)/2;;
        int USM=(K+1)/2+(1-K%2);
        for(int i=0;i<(K+1)/2;i++){
            S+="10";
            if(i==0){
                for(int j=0;j<N-USN;j++)S.push_back('0');
            }
        }
        
        
        if(K%2==0)S+="1";
        for(int j=0;j<M-USM;j++)S.push_back('1');
        if(is_ok(S,K,N,M)){
            AN=min(AN,S);
        }
    }
    if(AN=="3")AN="-1";
    cout<<AN<<endl;

}