X=input()

if X in ["5","Welcome to yukicoder!","1+2+10","Let's enjoy"]:
    print("Hello World!")
elif " " in X:
    S=input()
    P,Q=map(int,X.split())
    print(P+Q,S)
elif int(X)==51:
    for i in range(1,52):
        if i%3==0 and i%5==0:
            print("FizzBuzz")
        elif i%3==0:
            print("Fizz")
        elif i%5==0:
            print("Buzz")
        else:
            print(i)
elif int(X)==10:
    print(5942201175040512342)
elif int(X)==100:
    print(4240983281189952799)


elif 1<=int(X)<=100:
    X=int(X)
    print(X*(X+1)//2)