#include<stdio.h>   

int main(){ 
	int i,c=0;

	
	for(i = 3;i <= 1000;i++){
		int b = i / 100;
		int s = i / 10 % 10;
		int g = i % 10;
		
		if(b == 3 || s == 3 || g == 3){
			c++;
		}
	}
	
	printf("%d",c);
	return 0;
} 
/**************************************************************
	Problem: 1056
	User: admin
	Language: C
	Result: Runtime Error
****************************************************************/