Problem:
Score : 200 points

Problem Statement

In some village, there are 999 towers that are 1,(1+2),(1+2+3),...,(1+2+3+...+999) meters high from west to east, at intervals of 1 meter.

It had been snowing for a while before it finally stopped. For some two adjacent towers located 1 meter apart, we measured the lengths of the parts of those towers that are not covered with snow, and the results are a meters for the west tower, and b meters for the east tower.

Assuming that the depth of snow cover and the altitude are the same everywhere in the village, find the amount of the snow cover.

Assume also that the depth of the snow cover is always at least 1 meter.

Constraints

1 \leq a < b < 499500(=1+2+3+...+999)

All values in input are integers.

There is no input that contradicts the assumption.

Input

Input is given from Standard Input in the following format:

a b

Output

If the depth of the snow cover is x meters, print x as an integer.

Sample Input 1

8 13

Sample Output 1

2

The heights of the two towers are 10 meters and 15 meters, respectively.
Thus, we can see that the depth of the snow cover is 2 meters.

Sample Input 2

54 65

Sample Output 2

1

Solution in C (GCC 5.4.1) (judge verdict: Accepted)

/* ex 4-3
    kas056 */
#include <stdio.h>

int height(int a, int b);//関数の宣言

int main(void){
    int length_1, length_2, snow;
    scanf("%d %d", &length_1, &length_2);//入力を読み取る

    snow = height(length_1,length_2);//関数（後述）を呼ぶ

    printf("%d", snow);

    return 0;
}

int height(int a,int b){//関数を作る
    int pole = 0;
    int difference = b - a;

    //雪の深さによっては二本の柱の差は変化しないことを利用する
    for (int i = 1; i < difference ; i ++){
        pole += i;//差がdifferenceとなる隣り合わせの柱のうち、低い方を求める
    }

    return (pole - a);//低い柱の本来の高さ-測定した低い方の柱=雪の深さ
}