Add subtract and multiply#8653

Add subtract and multiply

1 second

128 megabytes

Very easy

Let $x$ be a variable initially equal 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 does not exceed $1 0^{9}$ 10^9 by absolute value.

Output

Print the resulting value of $x$ .

Examples

Example 1

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Example 2

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1 0^{9}