package LanQiaoOJ;

public class ÃÅÅÆÖÆ×÷2 {
	  public static void main(String [] args) {
		  int count=0;
		  for(int i=1;i<=2020;i++) {
			  int x=i;
			  while(x>0) {
				  if(x%10==2) {
					  count++;
				  }
				  x/=10;
			  }
		  }
		  System.out.print(count);
	  }
}