#include<iostream> using namespace std; int main() { int n,ge,shi,bai,cnt=0; cin>>n; for(int i=103;i<=n*100+(n-1)*10+n-2;i+=2) { ge=i%10; shi=i/10%10; bai=i/100; if(ge!=shi&&ge!=bai&&shi!=bai&&ge<=n&&shi<=n&&bai<=n) { cnt++; } } cout<<cnt; return 0; }