from sys import stdin
from sys import stdout


def main(inp, inps, put):
    N, Q = map(int, inp().split())
    L, R = list(zip(*map(lambda x: list(map(int, x.split())), inps())))
    result = [0]*Q
    bits = [1]*(N+2)
    now_sum = 0
    for i, (l, r) in enumerate(zip(L, R)):
        for j in range(l, r+1):
            now_sum += bits[j]
            bits[j] *= -1
        result[i] = now_sum
    
    put("\n".join(map(str, result)))


main(stdin.readline, stdin.readlines, stdout.write)