#include<bits/stdc++.h> using namespace std; int main() { long long a,b,sum=0,c; cin>>a>>b; for(int i=a;i<=b;i++) { c=i; while(c!=0) { if(c%10==2) sum++; c/=10; } } cout<<sum; return 0; }

#include<bits/stdc++.h> using namespace std; int gcd(int a,int b) { if(a%b==0) return b; else return gcd(b,a%b); } int a,b,sum; int main() { cin>>a>>b; for(int i=a;i<=b;i++) { int j=ab/i; if(gcd(i,j)==a && ij/gcd(i,j)==b) sum++; } cout<<sum; return 0; }