Calculate distance travelled by body.(FUNCTION)

DECLARE FUNCTION DIS(V,T,A)
CLS
INPUT"ENTER VELOCITY";V
INPUT"ENTER TIME";T
INPUT"ENTER ACCELERATION";A
PRINT"DISTANCE TRAVELLED BY A BODY=";DIS(V,T,A)
END

FUNCTION DIS(V,T,A)
S=V*T+1/2*A*T^2
DISTANCE=S
END FUNCTION