Final Score Calculation

You are given an initial score S and a sequence of operations. Each operation is a string formatted as increase X or decrease X, where X is an integer.

Your task is to compute the final score after processing all the operations in order. Specifically, if the operation is increase X, add X to the current score; if it is decrease X, subtract X from the current score.

The computation can be expressed mathematically as follows:

$$S_{final} = S + \sum_{i=1}^{N} \Delta_i$$

where $$\Delta_i = \begin{cases} +X_i, & \text{if the } i^\text{th} \text{ operation is } \texttt{increase } X_i \\ -X_i, & \text{if the } i^\text{th} \text{ operation is } \texttt{decrease } X_i \end{cases}$$

Implement a solution that reads input from stdin and prints the result to stdout.

inputFormat

The input is given in the following format:

• The first line contains an integer S, the initial score.
• The second line contains an integer N, the number of operations.
• The following N lines each contain an operation string in the format increase X or decrease X.

outputFormat

Output a single integer which is the final score after performing all the operations.

## sample

100
3
increase 50
decrease 20
increase 30

160