The task is to generate the correct answer for a given math problem.

Ex Input:
Problem: a certain bacteria colony doubles in size every day for 25 days , at which point it reaches the limit of its habitat and can no longer grow . if two bacteria colonies start growing simultaneously , how many days will it take them to reach the habitat ’ s limit ?

Ex Output:
2


Ex Input:
Problem: what is the units digit of 17 ^ 83 × 13 ^ 82 × 11 ^ 67 ?

Ex Output:
4


Ex Input:
Problem: for 2 consecutive yrs , my incomes are in the ratio of 4 : 7 and expenses in the ratio of 3 : 5 . if my income in the 2 nd yr is rs . 42000 & my expenses in the first yr in rs . 22000 , my total savings for the two - year is

Ex Output:

s . 9000