#pragma GCC optimize("Ofast") #pragma GCC target("avx2") #define getrp() ({char*mmap();mmap(0l,1l<<25,1,2,0,0ll);}) #define rd_skip() while(*rp++>=48) #define rd() ({int _v=0,_c;while(_c=*rp++-48,_c>=0)_v=_v*10+_c;_v;}) #define wt(v) ({unsigned _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 f(a) (a>0?(a)*(a+1):0) #define MD 998244353 int main(){ char*rp=getrp(); rd_skip(); int w=rd(); rd_skip(); long z=0; while(*rp){ long x=rd(); long y=rd(); long v=rd(); z+=v*(x*x-(f(x-y)+f(x-(w+1-y))>>1)); } wt1(z%MD); _exit(0); }