# Add subtract and multiply

Execution time limit is 1 second

Runtime memory usage limit is 128 megabytes

Let $x$ be a variable initially equals to $0$. Simulate the next operations with this variable:

add $a$: add value $a$ to $x$;

subtract $a$: subtract value $a$ from $x$;

multiply $a$: multiply $x$ by $a$;

## Input

Each line contains operation and value. Process all given operations. The value of the variable $x$ after each operation doen not exceed $10_{9}$ by absolute value.

## Output

Print the resulting value of $x$.

## Examples

Input #1

Answer #1

Input #2

Answer #2

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