casting.cpp

#include <iostream>
#include <cmath>
#include <cstdio>

using namespace std;

int main(){

    int n, a, b, c, mm;
    cin >> mm >> n >> a >> b >> c;
    if (a > b)
        swap(a, b);
    if (b > c)
        swap(b, c);
    if (a > b)
        swap(a, b);
    if (mm == 2)
        cout << a << endl;
    else
        cout << ((a + b - n) > 0 ? (a + b - n) : 0) << endl;
    return 0;
}