Problem:
Score : 100 points

Problem Statement

We have an N \times N square grid.

We will paint each square in the grid either black or white.

If we paint exactly A squares white, how many squares will be painted black?

Constraints

1 \leq N \leq 100

0 \leq A \leq N^2

Inputs

Input is given from Standard Input in the following format:

N
A

Outputs

Print the number of squares that will be painted black.

Sample Input 1

3
4

Sample Output 1

5

There are nine squares in a 3 \times 3 square grid.
Four of them will be painted white, so the remaining five squares will be painted black.

Sample Input 2

19
100

Sample Output 2

261

Sample Input 3

10
0

Sample Output 3

100

As zero squares will be painted white, all the squares will be painted black.

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

/* ex2_2
   kohei_suzuki */

#include <stdio.h>
int main(void){
    int N; //マス目
    int A; //白のマス数

    scanf("%d", &N);//入力受取
    scanf("%d", &A);//入力受取

    if(1<=N && N<=100 && 0<=A && A<=N*N){
        printf("%d", N*N-A);
    }
    return 0;
}