OPEN "INPUT.TXT" FOR INPUT AS #1
INPUT #1, N, Q
DIM X1(10000) AS INTEGER
DIM Y1(10000) AS INTEGER
DIM X2(10000) AS INTEGER
DIM Y2(10000) AS INTEGER
DIM T1(10000) AS INTEGER
DIM T2(10000) AS INTEGER
FOR I = 1 TO N
INPUT #1, X1(I), Y1(I), X2(I), Y2(I), T1(I), T2(I)
NEXT I
CLOSE #1

FOR I = 1 TO N
V(I) = (X2(I) - X1(I)) / (T2(I) - T1(I))
NEXT I

TMI = T1(1)
FOR I = 1 TO N
IF T1(I) < TMI THEN TMI = T1(I)
NEXT I


TMA = T2(1)
FOR I = 1 TO N
IF T2(I) < TMA THEN TMA = T2(I)
NEXT I

FOR I = 1 TO N
S(I) = X1(I)
NEXT I

FOR P = TMI TO TMA
SOOB = -1
FOR I = 1 TO N
IF (P >= T1(I)) AND (P <= T2(I)) THEN S(I) = V(I) * P
NEXT I

FOR I = 2 TO N
R = S(I) - S(I - 1)
IF R <= Q THEN
 SOOB = P
 GOTO KON:
END IF
NEXT I

NEXT P


KON:
OPEN "OUTPUT.TXT" FOR OUTPUT AS #2
PRINT #2, SOOB
CLOSE #2
SYSTEM