Условный оператор

#include <iostream>
using namespace std;
int main() {
    int a, b, c;
    cin >> a >> b >> c;
    if(a <= 0 || b <= 0 || c <= 0) {
        cout << "ERROR";
    }
    else if(a + b <= c || a + c <= b || b + c <= a) {
        cout << 0;
    }

    else {

    if(a == b && a == c && b == c) {
        cout << 3;
    }
    else if(a == b || b == c || a == c) {
        cout << 2;
    }
    else {
        cout << 1;
    }
}
}