#include <iostream>
#include <cmath>
#include <set>
using namespace std;
int main(int argc, char *argv[])
{
    set<long long> numbers;
    long long a;
    bool b=false;
    do{
        cin >> a;
        if (numbers.count(a)) b=true;
        numbers.insert(a);
    }
    while (a!=0);

    cout << (b?"Yes":"No");
    return 0;
}