50235 - How Many Years

After how many years?

A man invests $A and $B to two different companies. A grows 3% per year. B grows 2% per year.

Write a program to find after how many years A will surpass B.

Input: You will be given 2 positive integers (M and N) and M < N.

Output : Show one integer: the number of years that A will be more than B.

Sample Input1:	Sample Input2:
500 700	1000 2000
Sample  Output1:	Sample  Output2:
35	72