level

def level(exp)
    level = 1

    return level if exp == 0

    while true do
            next_level     = level + 1
            level_exp      = (10 *(1.7 **level -1.7)/0.7).to_int
            next_level_exp = (10 *(1.7 **next_level -1.7)/0.7).to_int
            if level_exp < exp && exp <= next_level_exp then
                return level
            end
            level += 1
    end
end