1)
a=1
while a<=10:
b=1
while b<=10:
c=a*b
print(c, end=" ")
b+=1
print(" ")
a+=1
2)
x=int(input())
y=int(input())
ans=x
for i in range (1, y):
ans+=x
print(ans)
3)
N=int(input())
sum=0
i=1
while i<N+1:
sum+=i*2
i+=1
print(sum)
4)
N=int(input())
A=int(input())
sum=0
for i in range (A,N+1):
sum+=i*2
print(sum)
