#include <stdio.h>
#include <stdlib.h>
int main(){
	int a, b, c, sum=0 ;
	scanf("%d",&a);
	scanf("%d",&b);
	printf("入力データ1：%d\n",a);
	printf("入力データ2：%d\n",b);
	if (a<=b)
    	for (c=a ; c<=b ; c++){
         sum = sum + c;
			}
  else if (a>b)
      for (c=b ; c>a ; c++){
        sum = sum + c;
			}
		printf("出力データ：%d",sum);
	
   return 0;
}