C :

#include<stdio.h>
int main()
{
  int i;
  for(i=1;i<=999;i++){
    if(i%3==0&&((i%10==5)||(i/10)%10==5||(i/100)%10==5)) printf("%d\t",i);
  }
}

C++ :

#include<iostream>
#include<math.h>
using namespace std;
int main(){
int i,a,b,c,f = 0;
for(i = 1;i <= 999;i++)
{
  a = i / 100;
  b = i / 10 % 10;
  c = i % 10;
  if(i % 3 == 0){
      if(a == 5 || b == 5 || c == 5){ 
          cout<<i<<endl; 
      } 
  }
}
return 0;
}

Python :

for n in range(1,1000):
    a=n//100
    b=n//10%10
    c=n%10
    if n%3==0 and (a==5 or b==5 or c==5):
        print(n)