## BlueBook - World Pop

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

Problem types
##### BlueBook

The world's population is increasing at a rate of approximately each year. The population in year was .

Write a program to estimate the population in the future assuming that the present growth rate continues until that time.

#### Input Specification

The first line will be the rate of increase , the second line will be the starting year of the population , the third line will be the population for the starting year, and the last line will be the year at which we would like to estimate the population.

#### Output Specification

The output will simply be the population that we estimated in the final year.

#### Sample Input

1.6
1987
5000000000
2087

#### Sample Output

24453487116