#include <bits/stdc++.h>
#define rep(i, n) for (int i = 0; i < (int)(n); i++)
#define rrep(i, n) for (int i = (int)(n - 1); i >= 0; i--)
#define all(x) (x).begin(), (x).end()
#define sz(x) int(x.size())
using namespace std;
using ll = long long;
constexpr int INF = 1e9;
constexpr ll LINF = 1e18;
string YesNo(bool cond) {
    return cond ? "Yes" : "No";
}
string YESNO(bool cond) {
    return cond ? "YES" : "NO";
}
template <class T>
bool chmax(T& a, const T& b) {
    if (a < b) {
        a = b;
        return true;
    }
    return false;
}
template <class T>
bool chmin(T& a, const T& b) {
    if (b < a) {
        a = b;
        return true;
    }
    return false;
}
template <typename T, class F>
T bisect(T ok, T ng, const F& f) {
    while (abs(ok - ng) > 1) {
        T mid = min(ok, ng) + (abs(ok - ng) >> 1);
        (f(mid) ? ok : ng) = mid;
    }
    return ok;
}
template <typename T, class F>
T bisect_double(T ok, T ng, const F& f, int iter = 100) {
    while (iter--) {
        T mid = (ok + ng) / 2;
        (f(mid) ? ok : ng) = mid;
    }
    return ok;
}
template <class T>
vector<T> make_vec(size_t a) {
    return vector<T>(a);
}
template <class T, class... Ts>
auto make_vec(size_t a, Ts... ts) {
    return vector<decltype(make_vec<T>(ts...))>(a, make_vec<T>(ts...));
}
template <typename T>
istream& operator>>(istream& is, vector<T>& v) {
    for (int i = 0; i < int(v.size()); i++) {
        is >> v[i];
    }
    return is;
}
template <typename T>
ostream& operator<<(ostream& os, const vector<T>& v) {
    for (int i = 0; i < int(v.size()); i++) {
        os << v[i];
        if (i < sz(v) - 1) os << ' ';
    }
    return os;
}
int main() {
    int _n, _m, k;
    cin >> _n >> _m >> k;
    vector<string> v;
    /* 0から */ {
        int n = _n;
        int m = _m;
        string t = "";
        bool ok = true;
        while (sz(t) < k + 1) {
            if (sz(t) % 2 == 0) {
                if (n == 0) break;
                n--;
                t += '0';
            } else {
                if (m == 0) break;
                m--;
                t += '1';
            }
        }
        ok &= sz(t) == k + 1;
        if (m > 0) {
            ok &= sz(t) > 1;
            if (sz(t) > 1 && t.back() == '0') {
                t.pop_back();
                t += string(m, '1');
                t += '0';
            } else if (!t.empty() && t.back() == '1') {
                t += string(m, '1');
            }
        }
        if (n > 0) {
            t = string(n, '0') + t;
        }
        if (ok) v.push_back(t);
    }

    /* 1から */ {
        int n = _n;
        int m = _m;
        string t = "";
        bool ok = true;
        while (sz(t) < k + 1) {
            if (sz(t) % 2 == 1) {
                if (n == 0) break;
                n--;
                t += '0';
            } else {
                if (m == 0) break;
                m--;
                t += '1';
            }
        }
        ok &= sz(t) == k + 1;
        if (n > 0) {
            ok &= sz(t) > 1;
            if (sz(t) > 1) t = string(1, '1') + string(n, '0') + t.substr(1);
        }
        if (m > 0) {
            if (!t.empty() && t.back() == '0') {
                t.pop_back();
                t += string(m, '1');
                t.push_back('0');
            } else if (!t.empty() && t.back() == '1') {
                t += string(m, '1');
            }
        }
        if (ok) v.push_back(t);
    }

    if (v.empty()) {
        cout << -1 << '\n';
    } else {
        sort(all(v));
        cout << v[0] << '\n';
    }
}