#include<iostream>
using namespace std;
int main()
{
	char A[100];
	gets_s(A);
	int sum = 0, position = 0, result = 0;
	for (int i = 0, temp = 0; i <= strlen(A); i++)
	{
		if (A[i] == ' ' || A[i] == '\0')
		{
			if (position % 2 == 1)
			{
				for (temp; temp < position; temp++)
				{
					if (A[temp] == '1')
					{
						result++;
					}
				}
			}
			temp = i;
		}
		position++;
	}
	cout <<"Kol-vo ones = "<< result<<endl;
}