#pragma GCC optimize("Ofast") #pragma GCC target("avx2") char*mmap(); #define RD(v) v=0;{int _c;while(_c=*rp++-48,_c>=0)v=v*10+_c;} main(){ char*rp=mmap(0l,1l<<28,1,2,0,0ll); int RD(n); long RD(x); x*=1-n; do{ int RD(s); x+=s; }while(*rp); printf("%d",x); }