include<iostream
using namespace std;
int day[] = {31,28,31,30,31,30,31,31,30,31,30,31};//2月29回文仅有9220,不计
int main(){
int a, b, i, j, x;
int temp = 0, an;
cin >> a >> b; for(i = 1; i <= 12; i++){ //yue x = day[i-1]; for(j = 0; j <= x; j++){ //ri an = 0; if(j > 9){ //首两位 an = an + j % 10; an = an * 10 + j / 10; } else an = j * 10; if(i > 9){ //首4位 an = an * 10 + i % 10; an = an * 10 + i / 10; } else an = an * 100 + i *10; an = an * 100 + i; an = an * 100 + j; if(an >= a && an <= b){ temp++; } } } if(a <= 92200229 && 92200229 <= b) temp++; cout << temp << endl; return 0;
}
include<stdio.h>
int main()
{
int l, m, i;
int d[10010] = {0};
int x, y;
int a = 0;
scanf("%d%d", &l, &m); d[0] = 1; for (i = 1; i <= m; i++){ scanf("%d%d", &x, &y); d[x]--; d[y+1]++; } if(d[0] > 0) a++; for (i = 1; i <= l; i++){ d[i] += d[i-1]; if(d[i] > 0) a++; } printf("%d", a); return 0;
}