Trần Thanh Trà

from math import sqrt
x1 = int(input())
y1 = int(input())
x2 = int(input())
y2 = int(input())
d = sqrt((x2-x1)*(x2-x1)+(y2-y1)*(y2-y1))
print("{:.3f}".format(d))

from math import sqrt
a = int(input())
b = int(input())
c = int(input())
d = (a+b+c)/2
s = sqrt(p*(p-a)*(p-b)*(p-c)
print(d)
print("{:.3f}".format(s))

from math import sqrt
from math import pow
def distance_points(ax, ay, bx, by):
return sqrt(pow(bx - ax, 2) + pow(by - ay, 2))
x1 = int(input())
x2 = int(input())
x3 = int(input())
y1 = int(input())
y2 = int(input())
y3 = int(input())
dab = distance_points(x1, y1, x2, y2)
dbc = distance_points(x2, y2, x3, y3)
dac = distance_points(x1, y1, x3, y3)
print("d_AB = {:.3f}".format(dab))
print("d_BC = {:.3f}".format(dbc))
print("d_AC = {:.3f}".format(dac))

a = int(input())
b = int(input())
x = (a-2)*(b-2)
y = a*b-x
print(x)
print(y)

n = int(input())
S = (n*(n-1))/2
print("{:.0}".format(S))

N = int(input())
S = (N*(N+1)*(2*N+1))/6
print("{:.0}".format(S))

n = int(input())
print(n*n)

n = int(input())
s = (n*n+1))/2
print(s)

n = int(input())
s = n*n*(n+1)*(n+1)*(2*n*n+2*n-1)//12
print(s)

n = int(input())
s = (n*(n+1)*(n+2))/3
print(s)

n = int(input())
s = n/(n+1.0)
print(s)

n = int(input())
s = n*(n+3)/(4.0*(n+1)*(n+2))
print(s)

n = int(input())
s = n*(n+2)/((n+1)*(n+1))
print(s)

p = int(input())
n = int(input())
s = (p**(n+1)-1)//(p-1)
print(s)

p = int(input())
n = int(input())
s = ((n+1)*p**(n+1)//(p-1)-(p**(n+1)-1)//((p-1)**2)
print(s)

n = int(input())
if n%2==0:
  print("N la so chan")
else:
  print("N la so le")

n = int(input())
if (n%3==0) and (n%5!=0):
  print("True")
else:
  print("False")

a = int(input())
b = int(input())
res = a
if res<b:
  res = b
print(res)

a = int(input())
b = int(input())
c = int(input())
res = a
if res>b:
  res = b
if res>c
  res = c
print(res)

a = int(input())
b = int(input())
c = int(input())
m = a+b
n = b+c
p = a+c
res = m
if res<n:
  res = n
if res<p:
  res = p
print(res)

a = int(input())
b = int(input())
res = a*10+b
if res<b*10+a:
  res = b*10+a
print(res)