BlueBook - Pop Explosion

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Points: 3
Time limit: 1.0s
Memory limit: 16M

Problem type

The population of a certain country has been increasing at an average rate of P percent each year. Assuming that the population was A in year Y, write a program that finds the year in which the population will reach B if the grown pattern continues.

Input, Output

The order of input will be P, A, Y, B. Output should be in whole numbers (i.e. no decimals)

Sample Input

5.5 24000000 1980 100000000

Sample Output



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