#include <bits/stdc++.h>
using namespace std;
using ll = long long;
using pll = pair<ll, ll>;
#define drep(i, cc, n) for (ll i = (cc); i <= (n); ++i)
#define rep(i, n) drep(i, 0, n - 1)
#define all(a) (a).begin(), (a).end()
#define pb push_back
#define fi first
#define se second

const ll MOD = 1000000007;
const ll MOD2 = 998244353;
const ll INF = 1LL << 60;
const ll MAX_N = 2e5;

int main(){
    cin.tie(nullptr);
    ios::sync_with_stdio(false);
    
    ll n, m, k; cin >> n >> m >> k;

    if(n+m < k+1){
        cout << -1 << endl;
        return 0;
    }
    if(k==0){
        if(!(m==0 || n==0)){
            cout << -1 << endl;
            return 0;
        }
    }

    string inf = "";
    for(ll i=0; i<=1e5+1; i++) inf += '2';
    string ans = inf;
    //patern 1
    ll start1 = 0, last1 = k%2;
    ll zero1 = (k+2)/2, one1 = (k+1)/2;
    if(zero1<=n && one1<=m){
        if(last1==1){
            string ans1 = "";
            for(ll i=0; i<n-zero1; i++) ans1+='0';
            for(ll i=0; i<k+1; i++){
                if(i%2==0) ans1+='0';
                else ans1+='1';
            }
            for(ll i=0; i<m-one1; i++) ans1+='1';
            ans = min(ans, ans1);
        }else{
            string ans1 = "";
            for(ll i=0; i<n-zero1; i++) ans1+='0';
            for(ll i=0; i<k; i++){
                if(i%2==0) ans1+='0';
                else ans1+='1';
            }
            for(ll i=0; i<m-one1; i++) ans1+='1';
            ans1+='0';
            ans = min(ans, ans1);
        }
    }

    //patern 2
    ll start2 = 1, last2 = (k+1)%2;
    ll zero2 = (k+2)/2, one2 = (k+1)/2;
    if(zero1<=n && one2<=m){
        if(last2==0){
            string ans2 = "1";
            for(ll i=0; i<n-zero2; i++) ans2+='0';
            for(ll i=1; i<k; i++){
                if(i%2==1) ans2+='0';
                else ans2+='1';
            }
            for(ll i=0; i<m-one1; i++) ans2+='1';
            ans2+='0';
            ans = min(ans, ans2);
        }else{
            string ans2 = "1";
            for(ll i=0; i<n-zero2; i++) ans2+='0';
            for(ll i=1; i<k+1; i++){
                if(i%2==1) ans2+='0';
                else ans2+='1';
            }
            for(ll i=0; i<m-one1; i++) ans2+='1';
            ans = min(ans, ans2);
        }
    }

    if(ans==inf) cout << -1 << endl;
    else cout << ans << endl;
}