N, Q = map(int, input().split())
LR = [list(map(int, input().split())) for _ in range(Q)]
dp = [0 for _ in range(N)]
cnt = 0
for l, r in LR:
    l-=1
    r-=1
    for i in range(l, r+1):
        cnt-=dp[i]
        dp[i]=1-dp[i]
        cnt+=dp[i]
    print(cnt)