#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;} // reverse #define wt_rev(v) {long _z=v;do*--wp=_z%10+48;while(_z/=10);} #define SIEVE_N 50000001 int sieve[SIEVE_N]; void mksieve(){ for(int i=2;i1){ int p=sieve[j]; j/=p; if(sieve[j]==p){ j/=p; }else{ l*=p; } } count[l]+=1; } int res=0; for(int i=1;i<=n;++i){ res+=count[i]*count[i]; } char wbuf[64],*wp=wbuf+sizeof wbuf; wt_rev(res); write(1,wp,wbuf+sizeof wbuf-wp); _exit(0); }