#include <stdio.h>

int main() 
{
    int arr[5] = {0};
    for (int i = 0; i < 5; i++)
    {
        scanf("%d", &arr[i]);
    }
    int ret = 0;
    while (ret<6)
    {
        if (arr[ret] == 1)
        {
          ret++;
          break;
        }
        ret++;
    }
    printf("%d", ret);
    return 0;
}