#pragma GCC optimize("Ofast")
#pragma GCC target("avx2")

char*mmap();
#define RD(v) int v=0;{int _c;while(_c=*rp++-48,_c>=0)v=v*10+_c;}
#define RD_SKIP {while(*rp++>=48);}

char wbuf[1<<20];

#define WTHI(v) {long _z=v,_n=0,_d=0;while(++_n,_d=_d<<8|0x30|_z%10,_z/=10);*(long*)wp=_d;wp+=_n;}
#define WTLO(v) {long _z=v,_n=8,_d=0;while(_d=_d<<8|0x30|_z%10,_z/=10,--_n);*(long*)wp=_d;wp+=8;}
#define WT(v) if(v>=100000000){WTHI(v/100000000);WTLO(v);}else{WTHI(v);}

#define MD 1000000007

main(){
	char*rp=mmap(0l,1l<<28,1,2,0,0ll);
	char*wp=wbuf;
	RD_SKIP;
	do{
		RD(n);
		long x=1;
		while(n--){
			RD(a);
			x=x*(a+1)%MD;
		}
		x-=1;
		WT(x);
		*wp++=10;
		printf("%ld\n",x-1);
	}while(*rp);
	write(1,wbuf,wp-wbuf);
	_exit(0);
}