By Ricardo Martins, IFSULDEMINAS Brazil
Dona Clotilde is a very nice lady who lives in a village, in house which number is 71. It's not known why, but she had a reputation for being a witch. Clotilde was eager to watch a football game. One day, she bought a liquid to clean silver. With this, she won a coupon that gave her a number to compete for a ticket to the 2014 World Cup semifinal at Mineirão, the game between Germany and Brazil. The raffle happened and she won the ticket. Clotilde went to the game, Brazil lost 7 x 1, and everyone in the village thought that Brazil had lost that way because of her, poor thing! Her hacking nephew, San Tanaz, taking her aunt's pains, decided to create a computer virus that interfered with mathematical calculations, so that anything involving number 7 in the accounts would become 0.
For example:
3 + 4 = 0
33 + 44 = 0
17 + 11 = 21
8 x 9 = 2
12 x 7 = 0
8 + 9 = 10
Composed of a single line with two integers a and b (0 < a, b < 10000), separated by a sum or multiplication operator.
An integer corresponding to the result of the account, after the virus.
Input Samples | Output Samples |
3 + 4 |
0 |
17 + 11 |
21 |
8 x 9 |
2 |
9 x 18 |
162 |