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from math import sqrt

def distance(x1, y1, x2, y2):
    return sqrt((x2 - x1) ** 2 + (y2 - y1) ** 2)

x1 = float(input("x1> "))
y1 = float(input("y1> "))
x2 = float(input("x2> "))
y2 = float(input("y2> "))
x3 = float(input("x3> "))
y3 = float(input("y3> "))

print(x1, y1, x2, y2, x3, y3)

# side lengths
side1length = sqrt((x2 - x1) ** 2 + (y2 - y1) ** 2)
side2length = sqrt((x3 - x2) ** 2 + (y3 - y2) ** 2)
side3length = sqrt((x3 - x1) ** 2 + (y3 - y1) ** 2)

# add to get perimeter and print it
perimeter = side1length + side2length + side3length
print("Perimeter:", perimeter)