#!/usr/bin/env python3
    # -*- coding: latin-1 -*-

    from math import sqrt, floor

    def pyramide(briques):
        base = -1
        for i in range(floor(sqrt(briques)), briques):
            if i ** 2 == briques:
                base = i * 2 - 1
        return base

    if __name__ == '__main__':
        answ = input('Briques : ')
        answ = int(answ)
        verdict = pyramide(answ)

        if verdict == -1:
            print('Pas possible.')
        else:
            print('La base fait %d briques.' % verdict)