#include <iostream>
using namespace std;
int maxCounterOfActer(int n, int a, int b, int c) {

    return min(a, min(b, c));
}
int minCounterOfActer(int n, int a, int b, int c) {
    if ((n * 3 - a - b - c) >= n) {
        return 0;
    } else {
    return (n - (n * 3 - a - b - c));
    }
};

int main() {
    int n, a, b, c;
    int number;
    cin >> number;
    cin >> n >> a >> b >> c;
    switch (number) {
        case 1:
            cout << minCounterOfActer(n, a, b, c) << endl;
            break;
        case 2:
            cout << maxCounterOfActer(n, a, b, c) << endl;
            break;
    }
}