import math
def main():
 X,A,Y,B = map(int, input().split( ))
 S =X**A
 for num in range(A):
   if S%A ==0:
     S =X**A/B
   else:
     print("No")
     S = -1
     break
 if S>=0:
   print("Yes")
if __name__ == '__main__':
  main()