fun f(n) { if (n < 2) 1 else 1 + f(n-1) + f(n-2) }

start = microseconds();

n = f(30);
print(n, "\n");

time = microseconds() - start;

secs =        time / 1000000;
usec = String(time % 1000000);

while (length(usec) < 6) usec = "0"+usec;

print(secs, ".", usec, " seconds\n");

print(n * 1000 / (time / 1000), " function calls per second\n");