10 INPUT N
 20 LET A=0
 30 LET B=1
 40 GOSUB 70
 50 PRINT B
 60 STOP
 70 IF N=1 THEN RETURN
 80 LET C=B
 90 LET B=A+B
100 LET A=C
110 LET N=N-1
120 GOSUB 70
130 RETURN