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;

}