write a c++ programme

Task 1 (15 pts] A perfect cube is a number that has a whole number as its cube root i.e. Vo = p and p =I where p is a whole number and x is a perfect cube. Write a program that reads in, from a file named input1.txt, a number k and finds the sum of all positive perfect cubes below k. The sum should be written to a file named outputi.txt. See the example below. Example Listing 1: input1.txt 126 Listing 2: output1.txt 225