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

char*mmap();
char wbuf[1<<25];

#define rd(v) long v=0;{int _c;while(_c=*rp++-48,_c>=0)v=v*10+_c;}
#define wt(v) {long _z=v;do*--wp=_z%10+48;while(_z/=10);}
#define rep(v,e) for(long v=0;v<e;++v)

#define FWSIZE (1<<12)
int fw[FWSIZE];

static inline
void fw_add(int a){
	while(fw[a]+=1,a)a-=a&-a;
}

static inline
int fw_get(int a){
	int z=0;
	while(z+=fw[a],a+=a&-a,a<FWSIZE);
	return z;
}

main(){
	char*rp=mmap(0l,1l<<25,1,2,0,0ll);
	rd(n);
	long r=0;
	rep(i,n){
		rd(p);
		r+=fw_get(p);
		fw_add(p);
	}
	char wbuf[64],*wp=wbuf+sizeof wbuf;
	wt(r);
	write(1,wp,wbuf+sizeof wbuf-wp);
	_exit(0);
}