# include <bits/stdc++.h>
using namespace std;
using LL = long long;
using ULL = unsigned long long;
const double PI = acos(-1);
template<class T>constexpr T INF() { return ::std::numeric_limits<T>::max(); }
template<class T>constexpr T HINF() { return INF<T>() / 2; }
template <typename T_char>T_char TL(T_char cX) { return tolower(cX); }
template <typename T_char>T_char TU(T_char cX) { return toupper(cX); }
template<class T> bool chmin(T& a,T b) { if(a > b){a = b; return true;} return false; }
template<class T> bool chmax(T& a,T b) { if(a < b){a = b; return true;} return false; }
template<class T> bool is_sqare(T a) { if(floor(sqrt(a)) * floor(sqrt(a)) == a){ return true; }return false; }
int popcnt(unsigned long long n) { int cnt = 0; for (int i = 0; i < 64; i++)if ((n >> i) & 1)cnt++; return cnt; }
int d_sum(LL n) { int ret = 0; while (n > 0) { ret += n % 10; n /= 10; }return ret; }
int d_cnt(LL n) { int ret = 0; while (n > 0) { ret++; n /= 10; }return ret; }
template<class T> using dijk = priority_queue<T, vector<T>, greater<T>>;
# define ALL(qpqpq)           (qpqpq).begin(),(qpqpq).end()
# define UNIQUE(wpwpw)        sort(ALL((wpwpw)));(wpwpw).erase(unique(ALL((wpwpw))),(wpwpw).end())
# define LOWER(epepe)         transform(ALL((epepe)),(epepe).begin(),TL<char>)
# define UPPER(rprpr)         transform(ALL((rprpr)),(rprpr).begin(),TU<char>)
# define REP(i,upupu)         for(LL i = 0, i##_len = (upupu);(i) < (i##_len);(i)++)
# define REPS(i,opopo)        for(LL i = 1, i##_len = (opopo);(i) <= (i##_len);(i)++)
# define len(x)                ((int)(x).size())
# define BIT(n)               (1LL << (n))
# define pb push_back
#ifdef LOCAL
#  include "_debug_print.hpp"
#  define debug(...) debug_print::multi_print(#__VA_ARGS__, __VA_ARGS__)
#else
#  define debug(...) (static_cast<void>(0))
#endif

struct INIT{
    INIT(){
        std::ios::sync_with_stdio(false);
        std::cin.tie(0);
        cout << fixed << setprecision(20);
    }
}INIT;

void solve(){
    int n, m, k;
    cin >> n >> m >> k;
    if(n == 0 || m == 0){
        if(k == 0){
            cout << (m == 0 ? string(n, '0') : string(m, '1')) << endl;
        }else{
            cout << -1 << endl;
        }
        return;
    }

    if(k == 0){
        cout << -1 << endl;
        return;
    }

    string ans = "";
    REP(i, k){
        if(i % 2 == 0){
            ans += '0';
            n--;
            if(n == 0){
                cout << -1 << endl;
                return;
            }
        }else{
            ans += '1';
            m--;
            if(m == 0){
                cout << -1 << endl;
                return;
            }
        }
    }

    ans = string(n, '0') + ans;

    if(ans.back() == '0'){
        ans = ans.substr(0, len(ans) - 1);
        ans += string(n, '0');
        ans += '1';
    }else{
        ans += string(m, '1');
    }

    cout << ans << endl;
}

int main(){
    int t = 1;
    //cin >> t;
    while(t--)solve();
}