#include // nCr // nCr = n! / (r!*(n-r)!) // nC0 = 1 // nCr = ((n-r+1)*nCr-1 )/r̃[v int fc(int a,int b){ int i,ans=1; for(i=1;i<=b;i++){ ans =ans * (a -i + 1)/i; } return ans; } int main(void){ int m,n; printf("m="); scanf("%d",&m); printf("n="); scanf("%d",&n); printf("%dC%d=",m,n); printf("%d",fc(m,n)); return 0; }