#include <stdio.h>

/* count lines in input */

main()
{
	int c, nl;

	nl = 0;
	while ((c = getchar()) != EOF)
	   if (c == '\n')
		++nl;
	printf("%d\n", nl);
}




/*

 * Character constants: 'a', 'B', '\n', '\t'

 * String constants: "hello, world\n", "a", "\n"

 */