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Problems

Add subtract and multiply

Add subtract and multiply

Time limit 1 second
Memory limit 128 MiB

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 data

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 data

Print the resulting value of x.

Examples

Input example #1
add 2
subtract 5
subtract 1
multiply -3
Output example #1
12
Input example #2
subtract 5
multiply -5
add 5
Output example #2
30