Counting primes. Compare PrimeSieve with the method that we used to demonstrate the break statement, at the end of SECTION 1.3. This is a classic example of a space–time tradeoff: PrimeSieve is fast, but requires a boolean array of length n; the other approach uses only two integer variables, but is substantially slower. Estimate the magnitude of this difference by finding the value of n for which this second approach can complete the computation in about the same time as java PrimeSeive 1000000.