var n,i,k,t,q,r,p0,q0,s0: integer; A,B: array[1..1000] of integer; f: text; BEGIN assign(f,'input.txt'); reset(f); read(f,n); for i:=1 to n do read(f,a[i]); close(f); assign(f,'output.txt'); rewrite(f); k:=1; while kN then r:=N else r:=t+2*k; p0:=t; q0:=q; s0:=t; while (p0<>q) or (q0<>r) do if (p0