Problem Description

Given two integers, each with no more than 100 digits and being powers of 10, you need to compute their product or sum.

Input Format

The input consists of three lines.

The first and third lines each contain an integer, representing the numbers to be calculated. The second line contains a character, either * (multiplication) or + (addition), indicating the operation to be performed. The data is generated under Windows, so be aware of the $\r$ suffix.

Output Format

Output a single line containing an integer, representing the result of the operation.

Sample Input and Output

Sample Input #1

1000
*
100

Sample Output #1

100000

Sample Input #2

10000
+
10

Sample Output #2

10010

Sample Input #3

10
+
1000

Sample Output #3

1010

Sample Input #4

1
*
1000

Sample Output #4

1000

Notes

Translated from COCI2008-2009 CONTEST #6 T1 BUKA.

见题面 Input 部分

见题面 Output 部分