Problem Statement

Strawberries are healthy fruits full of antioxidants and vitamin C.
You have a basket with T Strawberries and want to make a simple program that will print the current count of Strawberries in the basket if you remove X Strawberries and add back Y Strawberries.

Constraints

T, X and Y are integers from 1 to 50. T is the number of Strawberries in the basket.
X is the number of Strawberries you removed from the basket.
Y is the number of Strawberries you added back into the basket.

Input

Input is in the following format:

T
X
Y

Output

Print the total number of Strawberries remaining in the basket.

Samples

Sample 1

Sample 2

Sample 3