#include <stdio.h>

int main() {
    int n, r;
    printf("Enter the value of n and r: \n");
    scanf("%d%d", &n,&r);
    
    if (n < 0 || r < 0 || n < r) 
    {
        printf("Invalid input\n");
        return 1;
    }

    int nfact = 1,rfact = 1,nmrfact = 1;
        
    for (int i = 1; i <= n; i++) 
    {
        nfact *= i;
    }

    for (int i = 1; i <= r; i++) 
    {
        rfact *= i;
    }

    for (int i = 1; i <= (n - r); i++) 
    {
        nmrfact *= i;
    }

    int permutation = nfact/ nmrfact;
    int combination = nfact / (rfact * nmrfact);

    printf("Permutation (nPr) = %d\n", permutation);
    printf("Combination (nCr) = %d\n", combination);

    return 0;
}