#include <stdio.h> int main () { int b,c,d,e,f,g,n; d=0, f=0, g=0; scanf ("%d", &n); for (b=1; g<n; b++) { e=0; for (c=b; c!=0; c/10) { d=c%10; if (d==9) e++; } if (e>1) { f=f+d; g++; } } printf ("%d",f); }