QBasic to dislpay armstrong or not

CLS
INPUT "Enter a number"; N
A = N
S = 0
WHILE N <> 0
R = N MOD 10
S = S + R ^ 3
N = N \ 10
WEND
IF A= S THEN
PRINT "It is armstrong number";
ELSE
PRINT "It is not armstrong number";
END IF
END