#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 && shi!=bai && ge!=bai && ge<=n && shi<=n && bai<=n) { cnt++; } } cout << cnt; return 0; }