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#include <iostream>
using namespace std;
int additive_inverse(int a, int m) {
    a = a % m;

    int inverse = (m - a) % m;
    return inverse;
}
int main() {
    int a, m;
    cout << "Enter the number a: ";
    cin >> a;
    cout << "Enter the modulus m: ";
    cin >> m;
    int inverse = additive_inverse(a, m);
    cout << "The additive inverse of " << a << " under modulo " << m << " is: " << inverse << endl;
    return 0;
}