#include<stdio.h>
int min(int a,int b)
{
	if(a<=b)
	return a; else return b;
}
int bin(int n,int k)
{
	int arr[n+1][k+1],i=0,j;
	for(i=0;i<=n;i++)
	{
		for(j=0;j<=min(i,k);j++)
		{
			if(j==0 || j==i)
			arr[i][j]=1;
			else
			arr[i][j]=arr[i-1][j]+arr[i-1][j-1];
		}
	}
	/*for(i=0;i<=n;i++)
	{
		for(j=0;j<=k;j++)
		{
			printf("%d ",arr[i][j]);
		}
		printf("\n");
	}*/
	return arr[n][k];
}
int main()
{
	int n,k;
	scanf("%d",&n);
	scanf("%d",&k);
	int x=bin(n,k);
	printf("\nvalue is %d",x);
}

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