C :

#include<stdio.h>
int main()
{
	int x,b,i;
	while(scanf("%d",&x)==1)
	{
		for(i=1;i<=x;i++)
			scanf("%d",&b);
		if(x%2==1)printf("1\n");
		else printf("0\n");
	}
	return 0;
}

C++ :

#include<stdio.h>
#include<string.h>
int main ()
{
    int n,num[120],x,flag;
    int i,j,k;
    while (scanf("%d",&n)!=EOF)
    {
    	if(n==0)
    	break;
        memset(num,0,sizeof(num));
        for (i=0;i<n;++i)
        {
            scanf("%d",&x);
            num[x]++;
        }
        flag=0;
        for (i=1;i<101;++i)
        {
            if (num[i]&1)
            {
                flag=1;
                break;
            }
        }
        printf("%d\n",flag);
    }
    return 0;
}