def ss(a,b,c,d):
if a=="Y" and b=="Y" and c=="Y":
return "234"
elif a=="Y" and b=="Y" and c=="N":
return "23"
elif a=="Y" and b=="N" and c=="Y":
return "24"
elif a=="N" and b=="Y" and c=="Y":
return "34"
elif a=="Y" and b=="N" and c=="N":
return "2"
elif a=="N" and b=="Y" and c=="N":
return "3"
elif a=="N" and b=="N" and c=="Y":
return "4"