#include<bits/stdc++.h>
using namespace std;
typedef long long LL;
LL memo[20][11][11][2][2][2];
string s[2];
LL DP(LL digit_ke,LL last1,LL last2,LL flag,LL kata,LL tzero){
if(digit_ke>=s[kata].length())return 1;
if(memo[digit_ke][last1][last2][flag][kata][tzero]!=-1)return memo[digit_ke][last1][last2][flag][kata][tzero];
LL ans=0;
if(flag==1){
if(tzero==1){
if(s[kata][digit_ke]=='0')ans+=DP(digit_ke+1,10,last1,1,kata,1);
else ans+=DP(digit_ke+1,(LL)(s[kata][digit_ke]-'0'),last1,1,kata,0);
}
else{
if((LL)(s[kata][digit_ke]-'0')!=last1 && (LL)(s[kata][digit_ke]-'0')!=last2)ans+=DP(digit_ke+1,(LL)(s[kata][digit_ke]-'0'),last1,1,kata,0);
}
for(LL dig=0;dig<(LL)(s[kata][digit_ke]-'0');dig++){
if(tzero==1){
if(dig==0)ans+=DP(digit_ke+1,10,last1,0,kata,1);
else ans+=DP(digit_ke+1,dig,last1,0,kata,0);
}
else{
if(dig!=last1 && dig!=last2)ans+=DP(digit_ke+1,dig,last1,0,kata,0);
}
}
}
else{
for(LL dig=0;dig<=9;dig++){
if(tzero==1){
if(dig==0)ans+=DP(digit_ke+1,10,last1,0,kata,1);
else ans+=DP(digit_ke+1,dig,last1,0,kata,0);
}
else{
if(dig!=last1 && dig!=last2)ans+=DP(digit_ke+1,dig,last1,0,kata,0);
}
}
}
return memo[digit_ke][last1][last2][flag][kata][tzero]=ans;
}
int main(){
ios_base::sync_with_stdio(false);cin.tie(NULL);cout.tie(NULL);
memset(memo,-1,sizeof(memo));
LL L,res2;
cin >> L >> s[1];
LL res1=DP(0,10,10,1,1,1);
if(L==0)res2=0;
else{
L--;
s[0]=to_string(L);
res2=DP(0,10,10,1,0,1);
}
//cout << res1 << " " << res2 << endl;
cout << res1-res2 << endl;
return 0;
}
