public static void abcd(String str) {
BigInteger sum = BigInteger.ZERO;
StringBuffer n = new StringBuffer("");
for (int i = 0; i < str.length(); i++) {
BigInteger ab = BigInteger.valueOf(((int) str.charAt(i)) - 96);
sum = sum.add(div.pow(str.length() - i - 1).multiply(ab));
}
String s = sum.toString();
for (int i = 0; i < s.length(); i++) {
if (i % 3 == 0 && i != 0) n.insert(0, ",");
n.insert(0, s.charAt(s.length() - i - 1));
}
while (str.length() < 22) str = str + " ";
System.out.println(str + "" + n);
}
public static void main(String[] args) throws IOException {
Scanner scanner = new Scanner(new BufferedInputStream(System.in));
BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
while (scanner.hasNextInt()) {
int n = scanner.nextInt();
int k = scanner.nextInt();
BigInteger sum = BigInteger.ONE;
for (int i = n; i > n - k; i--) {
sum = sum.multiply(BigInteger.valueOf(i));
}
for (int i = 2; i <= k; i++) {
sum = sum.divide(BigInteger.valueOf(i));
}
System.out.println(sum.toString().length());
}
}