BufferedReader reader = new BufferedReader(new InputStreamReader(System.in)); int maximum = 0 ; int n=-1; while(n<=0) { n = Integer.parseInt(reader.readLine()); } if(n>0) { for (int i = 0; i < n; i++) { int x = Integer.parseInt(reader.readLine()); if (x > maximum) maximum = x; } System.out.println(maximum); }