#---------------------------- finding Sum and Product of n numbers --------------------------

nums =[] #initializing empty list to get elements
n1 = int(input("Enter the no.of elements : ")) # no. of elements
add =0  
mul =1
for i in range(n1):
    print(i+1,"Enter number :",end='')
    ele =int(input())
    nums.append(ele)
    add += nums[i]  # adding all element in list
    mul *= nums[i]  # multiplying all element in list
print("The sum is : ",add)
print("The product is : ",mul)

#---------------------------- finding Sum and Difference numbers -----------------------------

n1 = eval(input("Enter 1st number :"))
n2 = eval(input("Enter 2nd number :"))
n3 = eval(input("Enter 3rd number :"))
n4 = eval(input("Enter 4th number :"))
add= (n1+n2),(n3+n4)
sub =(n1-n2), (n3-n4)

print("\nSum : (",n1,"+",n2,",",n3,"+",n4,") =",add) #print("Sum : ",add)
print("\nDifference : (",n1,"-",n2,",",n3,"-",n4,") =",sub) # print("difference :",sub)

#---------------------------- finding  positive, negative of numbers -------------------------

n1 = int(input("Enter 1st number :"))
n2 = int(input("Enter 2nd number :"))

if(n1 == 0 & n2 ==0 ):  # checking for zeros
    print("All are zero.")
if(n1 == n2 & n2==n1):  # checking for equality
    print("All are Equal")

# Checking for negative
if(n1<0 or n2<0 ):  
    if(n2<0 ):
        print("2nd number",n2,"is negative")
    if(n1<0 ):
        print("1st number",n1,"is negative")
    else:
         print()

# Checking for positive

if(n1>0 and n2>0 ):
    print("All are postive")
if(n1>0 or n2>0 ): # Checking for positive
    if(n1>0 ):
        print("1st number",n1,"is Positive")
    if(n2>0 ):
        print("2nd number",n2,"is Positive")
    


 

#---------------------------- n numbers of elements --------------------------------------

n =int(input("Enter the no.of numbers :"))
for i in range(1,n+1):
    print(i,end=' ')

#---------------------------- count numbers of elements of given range------------------------

sn =int(input("Enter the start number :"))
en =int(input("Enter the end number :"))
count =0
for i in range(sn,en+1): # range from start to  end+1
    print(i,end=' ')
    count+=1
print("\nNo. of element : ",count)

#---------------------------- check whether given number can form triangle -------------------

num = int(input("Enter a number :"))
p=0
i=1
while(num>=p):
    if(num==p):
        print("\ncan form Triangle" )
    p+=i
    i+=1