import math


def dis_points(lat1, lon1, lat2, lon2):
    """
    
    Parameters
    ----------
    lat1 : Integer
        Latitude of first point
    lon1 : Integer
        Longitude of first point
    lat2 : Integer
        Latitude of second point
    lon2 : Integer
        Longitude of second point

    Returns
    -------
    distance : Integer
        distance between two points in kilometers

    """
    R = 6373.0
    lat1 = math.radians(lat1)
    lon1 = math.radians(lon1)
    lat2 = math.radians(lat2)
    lon2 = math.radians(lon2)
    
    dlon = lon2 - lon1
    dlat = lat2 - lat1
    
    a = math.sin(dlat / 2)**2 + math.cos(lat1) * math.cos(lat2) * math.sin(dlon / 2)**2
    c = 2 * math.atan2(math.sqrt(a), math.sqrt(1 - a))
    distance = R * c
    return distance