m=input("Enter the name of child = ")
x=0
for i in range (1,6):
x+=int(input("Enter the marks of subject = "))
n=x/5
if (n>0 and n<=30):print("Your Name =",m,"\n","Your percentage =",n,"\n","Your grade = D")
elif (n>=31 and n<=60):print("Your Name =",m,"\n","Your percentage =",n,"\n","Your grade = C")
elif (n>=61 and n<=80):print("Your Name =",m,"\n","Your percentage =",n,"\n","Your grade = B")
elif (n>=81 and n<=90):print("Your Name =",m,"\n","Your percentage =",n,"\n","Your grade = A2")
elif (n>=91 and n<=100):print("Your Name =",m,"\n","Your percentage =",n,"\n","Your grade = A1")
else: print(end="")