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

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10 3