#a
s = 0
for i in range(100,501):
s += i
print(s)
#b
sb = 0
for i in range(int(input("a=")),501):
sb += i
print(sb)
#в
sc = 0
for i in range(-10,int(input("b="))+1):
sc += i
print(sc)
#г
sg = 0
for i in range(int(input("a=")),int(input("b="))+1):
sg += i
print(sg)