#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 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);
	RD(n);
	RD(m);
	RD(x);
	int c=0;
	do{
		RD(a);
		c^=a;
	}while(*rp);
	if(c){
		write(1,"0",1);
		_exit(0);
	}

	long z=1;
	long e=(long)x*(n-1)*(m-1)<<22;
	for(int i=42;i--;){
		z=z*z%MD;
		z+=e<0?z:0;
		e+=e;
	}
	z%=MD;
	char wbuf[16],*wp=wbuf;
	WT(z);
	write(1,wbuf,wp-wbuf);
	_exit(0);
}