#king
x,y=(int(i) for i in input().split())
x2,y2=(int(i) for i in input().split())
if x==y:
    if x2==y2 and x2<x:
        print(x+1)
    else:
        print(x)
else:
    if x>y:
        m=x
    else:
        m=y
    print(m)