问一下，为什么这个程序的第二个输入无法结束

#include<stdio.h>
#include<string.h>
struct fax{
char name[6];
int Dp;
struct fax *p;
}fa[3]={
{"Jenny",0},
{"Alice",0},
{"Sam",0}
};
int main()
{
int num,i,j;
scanf("%d",&num);
struct fac{
char xm[6];
}fac1[num];
for(i=0;i<=5;i++){
scanf("%s",fac1[i].xm);
}
for(j=0;j<num;j++){
for(i=0;i<3;i++)
{
if(strcmp(fa[i].name,fac1[j].xm)==0){
fa[i].Dp++;
}
}
}
for(i=0;i<3;i++){
printf("\n%s\t%d\n",fa[i].name,fa[i].Dp);
}
return 0;
}

scanf("%s",&fac1[i].xm);