import java.math.BigInteger;
import java.util.Scanner;
public class Main {
public static void main(String[] args) {
Scanner scanner = new Scanner(System.in);
int m = scanner.nextInt();
BigInteger a = scanner.nextBigInteger();
BigInteger b = scanner.nextBigInteger();
System.out.println(a.add(b).toString(m));
}
} import java.util.Scanner;
public class Main {
public static void main(String[] args) {
Scanner scan = new Scanner(System.in);
long m = scan.nextLong();
if (m == 0)
return;
long A = scan.nextLong(), B = scan.nextLong();
long C = A + B;
if (C == 0) {
System.out.print(0);
return;
}
String res = "";
while (C > 0) {
res = (C % m) + res;
C /= m;
}
System.out.print(res);
}
}