#!/bin/python

def time_calc(acres, homes, current, target):
    time = 0
    peasants = acres*25 + 10*homes*acres - current
    while current < target:
        soldiers = 1.5/float(100) * peasants * 1.1
        peasants -= soldiers
        current += soldiers
        time += 1
    return time

time_calc(1000, 0.5, 0.33*1000*25, 0.75*1000*25)