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/* INPUT:
10
6
2 5
0 2
1 3
5 6
4 7
7 9
OUTPUT:
4*/
#include <iostream>
#include <vector>
#include <fstream>
using namespace std;
int main(void)
{
ifstream in;
ofstream out;
in.open("input.txt");
out.open("output.txt");
int giorni, turniTot, i, j, tot = 0, m[2], x;
in >> giorni;
in >> turniTot;
vector< vector<int> > turni(turniTot, vector<int>(2));
int* eDay = new int[giorni];
for(i = 0; i < giorni; i++) eDay[i] = 0;
for(i = 0; i < turniTot; i++)
{
for(j = 0; j < 2; j++)
{
in >> x;
turni[i][j] = x;
}
}
for(i = 0; i < turniTot-1; i++)
{
if(turni[i][0] > turni[i+1][0]) {
m[0] = turni[i][0];
m[1] = turni[i][1];
turni[i][0] = turni[i+1][0];
turni[i][1] = turni[i+1][1];
turni[i+1][0] = m[0];
turni[i+1][1] = m[1];
}
if(turni[i][1] == giorni-1) {
m[0] = turni[i][0];
m[1] = turni[i][1];
turni[i][0] = turni[i+1][0];
turni[i][1] = turni[i+1][1];
turni[i+1][0] = m[0];
turni[i+1][1] = m[1];
}
}
for(i = 0; i < turniTot-1; i++)
{
if(eDay[turni[i][0]] == 0) {
for(j = turni[i][0]; j <= turni[i][1]; j++) eDay[j] = 1;
tot++;
} else if(eDay[turni[i][1]] == 0 && turni[i][1] > turni[i+1][0]) {
for(j = turni[i][1]; j >= turni[i][0]; j--) eDay[j] = 1;
tot++;
}
}
out << tot << endl;
delete[] eDay;
in.close();
out.close();
return 0;
}
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