#include <iostream>
#include <time.h>
#include <sys/resource.h>

using namespace std;

double get_cpu_time()
{ rusage ruse;
  getrusage(RUSAGE_SELF, & ruse);
  return ruse.ru_utime.tv_sec + ruse.ru_utime.tv_usec / 1000000.0 + 
         ruse.ru_stime.tv_sec + ruse.ru_stime.tv_usec / 1000000.0; }

long long int calls;
         
int A(int m, int n)
{ calls += 1;
  if (m == 0)
    return n + 1;
  if (n == 0)
    return A(m - 1, 1);
  return A(m - 1, A(m, n - 1)); }

int main(int argc, char * argv[])
{ int m = atol(argv[1]);
  int n = atol(argv[2]);
  calls = 0;
  double t1 = get_cpu_time();
  int r = A(m, n);
  double t2 = get_cpu_time();
  cout << "result: " << r << "\n";
  cout << "calls:  " << calls << "\n";
  cout << "time:   " << t2 - t1 << "\n"; }