#include <stdlib.h>
#include <iostream>

#define SIZE 500000000

double t[SIZE];

int main(int argc, char *argv[]) 
{
        int size = SIZE;
	if (argc == 2) size = atoi(argv[1]);
	
        double sum = 0;
        t[100] = t[size/2+1] = 1.0;

        for (int i=0; i<size; i++) {
		sum += t[i];
	}
	std::cout << "sum = " << sum << std::endl;
	return 0;
}