B. Four kettlebells
time limit per test
1 second
memory limit per test
256 megabytes
input
standard input
output
standard output

You have four kettlebells weighing respectively $$$p_1, p_2, p_3, p_4$$$. Is it possible to place all these weights on a balance scale so that the pans of these scales are in a state of equilibrium?

Input

Enter four integers $$$p_1, p_2, p_3, p_4$$$ ($$$1 \le p_i \le 10000$$$)

Output

Print 'YES' or 'NO' depending on whether the weights can be placed properly.

Examples
Input
7 3 5 5
Output
YES
Input
7 3 5 6
Output
NO