50079. Apple Pile

#include <stdio.h>
#include <stdlib.h>

int main(){
    int a, b;
    scanf("%d %d", &a, &b);
    int sum = (a + b) * (b - a + 1) / 2;
    int len = (a + b) + (b - a - 1) * 2;
    printf("%d\n%d\n", sum, len);
}