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import java.math.*;
public class Sol16 extends BaseSolution {
public void runSolution() {
String digits = new BigInteger("2").pow(1000).toString();
int sum = 0;
for (int i = 0; i < digits.length(); i++) {
sum += Integer.parseInt(new Character(digits.charAt(i)).toString());
}
System.out.println(sum);
}
}