#include <stdio.h>

int main()
{
  int x, n0 = 0, encontrou = 0;

  scanf("%d", &x);

  while (x >= 0) {

    if (x == 0) {
      n0++;
      if (n0 == 3)
	encontrou = 1;
    } else
      n0 = 0;

    scanf("%d", &x);
  }

  if (encontrou)
    printf("Sim\n");
  else
    printf("Nao\n");
  
  return 0;
}