input: Write a python function to calculate the total population of given countries.
  assert calculate_total_population(["India", "China", "United States", "Indonesia"], [1300000000, 1400000000, 329000000, 269000000]) == 3299000000
  assert calculate_total_population(["Country1", "Country2"], [1000000, 2000000]) == 3000000
  assert calculate_total_population(["A", "B", "C"], [500000, 1000000, 1500000]) == 3000000
output: def calculate_total_population(countries, populations):
      return sum(populations)