#include<stdio.h>
int main()
{
	int n, q;
	scanf("%d %d", &n, &q);
	int i;
	int a[500005];
	for (i = 0; i < n; i++)
		a[i] = 0;
	int ans = 0, l, r;
	for (; q > 0; q--)
	{
		scanf("%d %d", &l, &r);
		for (i = l - 1; i < r; i++)
		{
			if (a[i] == 0)
			{
				ans++;
				a[i] = 1;
			}
			else
			{
				ans--;
				a[i] = 0;
			}
		}
		printf("%d\n", ans);
	}
	return 0;
}