#include<stdio.h>
double fact(int n)
{
int i;
int sum = 1;
for(i=n;i>1;i--){
sum *= i ;
}
return sum;
}
int main()
{
int m,n;
double result;
scanf("%d %d",&m,&n);
result = fact(n)/(fact(m)*fact(n-m));
printf("result = %.0f",result);
}
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