#include <stdio.h>
#include <math.h>
 
int main()
{
  /*  １．自然数ｎ１・n2（n1<n2）を入力し、n1からn2までの数の合計ｓを計算しその結果を表示しなさい
    　　ただし、ｓは次式で表せれるものとする。ｓ＝n2・(n2+1)-(n1-1)/2
  */
  {
    int n1, n2;
    double s;
 
    printf("n1 = ");
    scanf("%d", &n1);
    printf("n2 = ");
    scanf("%d", &n2);
    s = n2 * (n2 + 1) - (n1 - 1) / 2.0;
    printf("answer = %f\n", s);
  }
  /*  2. 球の半径ｒを入力し、球の体積ｖを計算し、少数第２位まで表示しなさい
    π＝3.1415
    半径を入力してください-->10
    答えは4188.79になります。
  */
  {
    double r, v;
 
    printf("r = ");
    scanf("%lf", &r);
    v = 4.0 * M_PI   * r * r * r / 3;
    printf("answer = %.2f\n", v);
  }
  return 0;
}

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