uses crt; var f:text; n,m,i:word; sum:longint; begin assign(f,'DULIEU.INP');reset(f); read(f,m,n); close(f); assign(f,'KETQUA.OUT');rewrite(f); for i:=m to n do if i mod 2=0 then inc(sum,i); write(f,sum); close(f); end.
program bai_giai; var f,g:text; M,N,i,t:longint; begin Assign(f,'DULIEU.INP'); reset(f); Assign(g,'KETQUA.OUT'); rewrite(g); readln(f,m,n); t:=0; for i:=m to n do if i mod 2=0 then t:=t+i; write(g,t); close(f); close(g); end.