set serveroutput on
DECLARE 
x number := ∈
res number
BEGINselect sum(FLOOR(POWER(cos(3.14*MOD(foo+1, nn+1)),2)))into resfrom (select tab2.n nn, round(exp(sum(ln(tab1.n)))) foofrom( select level nfrom dualconnect by level <= x-1) tab1,(select level nfrom dualconnect by level <= x-1) tab2where tab1.n <= tab2.ngroup by tab2.n);
dbms_output.put_line(res);
END;
/