#include <stdio.h>
 
int kaijo(int n) {
int i, y=1;
	for(i=n; i>1; i--){
		y=y*i;
	}
return y;
}
int comb (int m, int k){
int y;
y=kaijo(m)/(kaijo(k)*kaijo(m-k));
return y;
}
int main() {
int m, k, result;
scanf("%d",&m);
printf("mを入力してください:%d\n",m);
scanf("%d",&k);
printf("kを入力してください:%d\n",k);
result=comb(m, k);
printf("%d個の中から%d個を取り出す組合せ数は、%d通りです。", m, k, result);
 
	return 0;
}
 

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10 3