import java.util.Scanner;
class Main{
    public static void main(String[] args){

        Scanner sc = new Scanner(System.in);
        while(sc.hasNext()){ 

            int n = sc.nextInt();
            int m = sc.nextInt();
            int[][] dp = new int[101][11];
             for(int i = 1;i<=n;i++){
                for(int j=1;j<=m;j++){
                    dp[i][j] = dp[i-1][j] + dp[i-1][j-1] +1;
                }
                if(dp[i][m]>=n){
                    System.out.println(i);
                    break;
                }
            }
        }
    }
}