Is Rectangle?

Given four positive integers A, B, C, D, determine if there’s a rectangle such that the lengths of its sides are A, B, C and D (in any order).

If any such rectangle exist return 1 else return 0.

1 <= A, B, C, D <= 100

First argument is an interger A.

Second argument is an interger B.

Third argument is an interger C.

Fourth argument is an interger D.

If any such rectangle exist whose sides are A, B, C, D in any orde then return 1 else return 0.

Input 1:

 A = 1
 B = 1
 C = 2
 D = 2

Input 2:

 A = 1
 B = 2
 C = 3
 D = 4

Output 1:

 1

Output 2:

 0

Explanation 1:

 
 The rectangle drawn above is one of the rectangles that can be formed by side length of 1, 1, 2, 2 so we will return 1.

Explanation 2:

 No such rectangle exist whose sides are 1, 2, 3, 4. So, we will return 0.