#include <stdio.h>

int main()
{
	int i, j, k, N, Q, L, R, A[500002] = {}, ans = 0;
	scanf("%d %d", &N, &Q);
	for (i = 1; i <= Q; i++) {
		scanf("%d %d", &L, &R);
		for (j = L; j <= R; j++) {
			if (A[j] == 0) ans++;
			else ans--;
			A[j] ^= 1;
		}
		printf("%d\n", ans);
	}
	fflush(stdout);
	return 0;
}