X1,Y1,X2,Y2,X3 = map(int,input().split())

def menseki_triangle(a,b,c):
    """
    a,b,cを頂点とする三角形の面積を求める。
    """
    x1,y1 = a[0],a[1]
    x2,y2 = b[0],b[1]
    x3,y3 = c[0],c[1]

    return abs((x1-x3)*(y2-y3)-(x2-x3)*(y1-y3))/2

a = menseki_triangle([0,0],[X1,Y1],[X3,0])
b = menseki_triangle([0,0],[X2,Y2],[X3,0])

if a == b:
    print("Yes")
else:
    print("No")