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

#define rd_init() char*rp=({char*mmap();mmap(0l,1l<<25,1,2,0,0ll);})
#define rd() ({int _v=0,_c;while(_c=*rp++-48,_c>=0)_v=_v*10+_c;_v;})
#define wt(v) ({ulong _z=v;do*--wp=_z%10+48;while(_z/=10);})
#define wt1(v) ({char wbuf[64],*wp=wbuf+sizeof wbuf;wt(v);write(1,wp,wbuf+sizeof wbuf-wp);})
#define rep(v,e) for(typeof(e) v=0;v<e;++v)
#define min(a,b) (a<=b?a:b)

typedef unsigned long ulong;

int z;
int d[10];
int e[40];

void f(unsigned a,int b){
	if(!b){
		z+=!e[a%40]++;
	}else{
		rep(i,10){
			if(d[i]){
				--d[i];
				f(a*10+i,b-1);
				++d[i];
			}
		}
	}
}

int main(){
	rd_init();
	int n=rd();
	rep(i,n){
		d[*rp++&15]+=1;
	}
	f(0,min(n,3));
	wt1(z);
	_exit(0);
}