/* package whatever; // don't place package name! */
 
import java.util.*;
import java.lang.*;
import java.io.*;
 
/* Name of the class has to be "Main" only if the class is public. */
class Ideone
{
	public static void main (String[] args) throws java.lang.Exception
	{
		int n=50;
		int count=0;
		for(int i=1;i<=n;i++){
			if(i%3==0||i%5==0){
		       count++;
			}
 
 
		}
		System.out.println(count);
 
		// your code goes here
	}
}

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