import java.math.BigDecimal;
import java.math.MathContext;

public class Euler80 {
    public static void main(String[] args) {
        MathContext mc = new MathContext(110);
        int total = 0;
        for (int n = 1; n <= 100; n++) {
            int r = (int) Math.sqrt(n);
            if (r * r == n)
                continue;
            BigDecimal val = new BigDecimal(n);
            BigDecimal sqrt = val.sqrt(mc);
            String s = sqrt.toPlainString().replace(".", "");
            int sum = 0;
            for (int i = 0; i < 100 && i < s.length(); i++)
                sum += s.charAt(i) - '0';
            total += sum;
        }
        System.out.println(total);
    }
}