gistfile1.cpp

#include <iostream>

using namespace std;


int main()
{
	int i,n;
	float a=1.0,b=2.0,s=0.0;
	cout<<"Input n";
	cin>>n;

	for(i=1;i!=n;i++)
	{
   		b = 2 * i;
   		s += a / b;
   		if (i % 2 == 0) then a += 2;
	}
	
	cout << "s = " << s;
	getch()
		
	return 0;
}