Code :
Report zfibo.
PARAMETERS: p_from TYPE i,
p_to TYPE i.
DATA: v_from TYPE i,
v_to TYPE i.
DATA: a TYPE i,
b TYPE i,
c TYPE i,
cnt type i.
START-OF-SELECTION.
v_from = p_from.
v_to = p_to.
MOVE v_from TO b.
cnt = 0.
DO v_to times.
IF v_to < cnt.
EXIT.
ENDIF.
c = a + b.
a = b.
b = c.
write: c.
cnt = b + 1.
enddo.
Result :


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