#include <iostream>
using namespace std;
 
double calculateMoles(double m, double M) {
    return m / M;
}
 
int main() {
    double m = 90.0; 
    double M = 180.0;
 
    double n = calculateMoles(m, M);
 
    cout << "Масса вещества: " << m << " г" << endl;
    cout << "Молярная масса: " << M << " г/моль" << endl;
    cout << "Количество вещества: " << n << " моль" << endl;
 
    return 0;
}

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