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import java.io.*; import java.util.*; class Test { } public class Main { public static void main(String args[]) { Scanner cin = new Scanner(System.in); int a, b, c, d; while(cin.hasNextInt()) { a = cin.nextInt(); b = cin.nextInt(); c = cin.nextInt(); d = cin.nextInt(); System.out.println(a + b + c + d); } } }
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