10 DEF FN r(x)=1/x
20 LET f$="FN r(i)"
30 LET lo=1: LET hi=100
40 GO SUB 1000
50 PRINT temp
60 STOP
1000 REM Evaluation
1010 LET temp=0
1020 FOR i=lo TO hi
1030 LET temp=temp+VAL f$
1040 NEXT i
1050 RETURN