#yukicoder No.1673 Lamps on a line
N, Q = map(int, input().split())

lamp = [0] * N

for _ in range(Q):
    L, R = map(int, input().split())
    for i in range(L - 1, R):
        if lamp[i] == 0:
            lamp[i] = 1
        else:
            lamp[i] = 0
    print(sum(lamp))