n=int(input("Enter the decimal number = "))
while n!=0:
d=n%16
n=n//16
if d==10:
print("A",end="")
elif d==11:
print("B",end="")
elif d==12:
print("C",end="")
elif d==13:
print("D",end="")
elif d==14:
print("E",end="")
elif d==15:
print("F",end="")
else:
print(d,end="")