C :

#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;
} 

C++ :

#include<iostream>
using namespace std;
int main(){
	int i,a,b,c,x;
	i=3;
	x=0;
	while(i<=993){
		a=i/100;
		b=i/10%10;
		c=i%10;
		if(a==3||b==3||c==3){
			x=x+1;
			
		}
		
		i=i+1;
	}

	
	cout<<x<<endl;
	

}
		

Pascal :

var 
	n,m:integer;
begin
	n:=0;
	for m:=1 to 999 do
		if (m div 100=3) or ((m-(m div 100)*100) div 10=3) or (m mod 10=3) then
			begin
				writeln(m);
				n:=n+1;
			end;
	writeln(n);
end.

Java :

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);
			
	}

}

Python :

# n =  int(input());
s = 0;
for i in range(1,1000):
    a = i // 100;
    b = i // 10 % 10;
    c = i % 10;
    if a == 3 or b == 3 or c == 3:
        s += 1;
print(s);