#include <stdio.h>
 
// 階乗を計算する関数
int factorial(int n) {
    int result = 1;
    for(int i = 1; i <= n; i++) {
        result *= i;
    }
    return result;
}
 
// 組合せを計算する関数
int comb(int m, int k) {
    return factorial(m) / (factorial(k) * factorial(m - k));
}
 
int main() {
    int m, k;
 
    printf("mとkの値を入力してください（mは12以下）: ");
    scanf("%d %d", &m, &k);
 
    if(m <= 12 && k <= m && k >= 0) {
        int result = comb(m, k);
        printf("%d個の中から%d個を取り出す組合せは %d 通りです。\n", m, k, result);
    } else {
        printf("不正な入力です。mは12以下、0 <= k <= m にしてください。\n");
    }
 
    return 0;
}
 

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12 5