import matplotlib.pyplot as plt
import numpy as np
import time







def main():




 print ('''Welcome user. This program is an simulation to start up a society in the present world. Here, you will
    be capable to calculate the cost, land, and resources you will require to supply for the population you calculate.
    At the same time, the growth of the population after a set amount of years will be shown as well, and you will
    have the option to see how the resources, land and cost will change throughout the years. Two forms will be shown
    with this program, a primeval civilization that is capable to supply for the survival of it's people, and a
    high quality civilization that is able to supply for the *pleasures* of it's people.''')

 while(True):
     start = input("Press Enter to Continue")
     if start == "":
        break
     if start != "":
         pass

 amount =  int(input ("Please insert the number of the starting population you want to work with: "))

 print ("You are starting your civilization with " + str(amount) + " people.")

 time.sleep(0.5)


# Data for plotting
 years = np.arange (0, 200, 1)
 t = np.arange (0,200, 1) ** 1.07
 fig, ax = plt.subplots()
 ax.plot(years, t)
 ax.set(xlabel='time (years)', ylabel=' population (mV)',
       title='About as simple as it gets, folks')
 ax.grid()

 fig.savefig("test.png")
 plt.show()