import java.io.*;
  
class Main {
    public static void main(String[] args) {
        BufferedReader kb = new BufferedReader( new InputStreamReader( System.in ) );
        try {
            int n = Integer.parseInt( kb.readLine() );
             
            int num;
			int cnt = n;
            int i, j;
            for( i=0; i<n; i++ ) {
                num = Integer.parseInt( kb.readLine() );
				if( 2 == num ) { continue; }
				if( 0 == num%2 ) {
					cnt--;
					continue;
				}
				int last = (int)Math.sqrt( (double)num );
                for( j=3; j<=last; j+=2 ) {
                    if( 0 == num%j ) {
                        cnt--;
						break;
                    }
                }
            }
             
            System.out.println( cnt  );
              
            kb.close();
        } catch( IOException e ) {
            System.err.println( e );
        }
    }
}
/tmp/hf-datasets-cache/medium/datasets/42704881117311-config-parquet-and-info-qiankunmu-Project_CodeNet-896c9d36/hub/datasets--qiankunmu--Project_CodeNet_Python800_and_Java250/snapshots/c899fde44a77ba1cc14973ed3de064e4ff3aadc7/Project_CodeNet_Java250.tar.gz