#include <iostream>

using namespace std;

class Fraction {
    long long x, y;
public:
    Fraction(long long x = 0, long long y = 1);
    void show();
    Fraction operator -() {
        long long a, c, z;
        a = this -> x * (-1);
        c = this -> y;
        return Fraction(a, c);
    }
    Fraction operator + (long long b) {
        long long a, c;
        a = this -> x + b * this -> y;
        c = this -> y;
        return Fraction(a, c);
    }
    void read();
};

Fraction::Fraction(long long x, long long y) {
    this -> x = x;
    this -> y = y;
}

void Fraction::show(){
    cout << x << "/" << y;
}

void Fraction::read() {
    char ch;
    cin >> x >> ch >> y;
}

int main() {
	long long z;
    Fraction a, c;
    cin >> z;
    a.read();
    a = -a;
    c = a + z;
    c.show();
    system("pause");
    return 0;
}