g = 0
while g <= 36:
    g += 1
    c = 36 - g
    if 2 * g + 4 * c == 100:
        print("ga:", g)
        print("cho:", c)

n = int(input("nhap so n: "))
S = 0
for i in range(1, 10):
    print (n, "x", i, "=", n*i)

n = int(input("nhap so n: "))
S = 0
for i in range(1, n+1):
    S += i**2
    T = (n*(n+1)*(2*n+1))/6
print("S=", S)
print("T=", T)
if S == T:
    print("S bang T")
else:
    print("S khac T")

n = int(input("nhap so n: "))
if n<=1 or n>20:
    print ("1<n<=20 ma")
else:
    S = 1
    for i in range(1, n+1):
        S += 1 / (2 * i)
    print("S=", S)

n = int(input("nhap so dien"))
if n <= 50:
    tien = n * 1678
elif n <= 100:
    tien = 50 * 1678 + (n - 50) * 1734
else:
    tien = 50 * 1678 + 50 * 1734 + (n - 100) * 2014
print("tien dien la", tien)

n = int(input('nhap nam duong lich:'))
if (n%400 == 0) or (n%4 == 0 and n% 100 != 0):
    print('day la nam nhuan')
else:
    print('day ko phai nam nhuan')

n = int(input("nhap so n: "))
T = 1
for i in range (1, n+1):
    T *=i
print ("T=", T)

n = int(input("m mua bao nhieu kg: "))
if n < 5:
    print("m dua t", n*20000)
else:
    print("m dua t", n*18000)

name = input("Nhap ho va ten cua ban: ")

t = int(input("Nhap diem toan cua ban: "))

v = int(input("Nhap diem van cua ban: "))

a = int(input("Nhap diem anh cua ban: "))

total = (t*2+v+a)/4

print("ten cua ba la:",name)

print("diem trung binh cua ban la:",total)

d = int(input("Nhap so thu nhat: "))

r = int(input("Nhap so thu hai: "))

c = d - r

s = d + r

print("tong cua 2 so vua nhap la:",s)

print("hieu cua 2 so vua nhap la:",c)