Trekking Mania

int grups = int.Parse(Console.ReadLine());

int musalla = 0;
int monbland = 0;
int kilimandjaro = 0;
int k2 = 0;
int everest = 0;
for (int i = 1; i <= grups; i++)
{
    int sumGrups = int.Parse(Console.ReadLine());
    if (grups <= 5)
    {
        musalla += sumGrups;
    }
    else if (grups >= 6 && grups <= 12)
    {
        monbland += sumGrups;
    }
    else if (grups >= 13 && grups <= 25)
    {
        kilimandjaro += sumGrups;
    }
    else if (grups >= 26 && grups <= 40)
    {
        k2 += sumGrups;
    }
    else if (grups >= 41)
    {
        everest += sumGrups;
    }

}
double result = musalla + monbland + kilimandjaro + k2 + everest;

double resultMusalla = musalla / result * 100;
double resultMonbland = monbland / result * 100;
double resultKilimandjaro = kilimandjaro / result * 100;
double resultK2 = k2 / result * 100;
double resultEverest = everest / result * 100;

Console.WriteLine($"{resultMusalla}%");
Console.WriteLine($"{resultMonbland}%");
Console.WriteLine($"{resultKilimandjaro}%");
Console.WriteLine($"{resultK2}%");
Console.WriteLine($"{resultEverest}%");