public class Main {

	public static void main(String[] args) {
		
      int m=0;
			for (int a=1;a<=1000;a++) {
				int b=a%10000/1000;
				int c=a%1000/100;
				int d=a%100/10;
				int e=a%10;
				if (b==3||c==3||d==3||e==3)					
					m++;}
			System.out.println(m);
			
	}

}
/**************************************************************
	Problem: 1056
	User: admin
	Language: Java
	Result: Runtime Error
****************************************************************/