#!/usr/bin/env python3
import sys


def calc_npv(cf, invest, discount):
    result = 0
    r = discount
    for i in range (len(cf)):
        result += ((cf[i])/((1+r)**(i+1)))
        #print(f"{i} ({cf[i]}) : {result}")
    return int(result)

def calc_irr(cf, invest, discount):
    counter = 0
    rate = 1
    gs = 0.1
    cnt = 0
    npv = calc_npv(cf,invest, gs)
    gs +=0.001
    if (cnt > 110):
        return -1
    else:
        cnt+=1
    while(npv > 0):
        #print(f"npv: {npv}")
        #print(f"gs: {gs}")
        npv = calc_npv(cf,invest, gs)
        gs +=0.001
        if (cnt > 110000):
            print(f"shit {gs} : {counter}")
            return -1
        else:
            cnt+=1
        counter +=1
    return gs



def main():
    #33000   34000   38000   40000
    cf = [400, 400, 400, 400]
    #cf = [333, 278, 231, 193]
    #cf = [35000, 40000, 45000, 50000, 0, 0, 0] # MOI VARIANT
    #cf = [33000, 34000, 35000, 31000]
    invest = 1000
    #invest = 116000 # MOI VARIANT
    discount = 0.2
    #discount = 0.12 # MOI VARIANT

    something = 0.1 # % CHTO ETO?!?!?!?!?!
    npv = calc_npv(cf, invest, discount)
    print(f"NPV = {npv}")
    #rent = npv/cf[0]
    rent = npv/invest
    print(f"RENT = {rent}")
    if (npv > 0):
        print("Выгодно")
    else:
        print("Невыгодно")

    mocha = calc_irr(cf, invest, discount)
    print(mocha)


if __name__ == "__main__":
    main()