#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) ({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 rep(v,e) for(typeof(e) v=0;v<e;++v)
#define reps(v,s,e) for(typeof(e) v=s;v<e;++v)
#define rrep(v,e) for(typeof(e) v=e;--v>=0;)
#define min(a,b) (a<=b?a:b)
#define max(a,b) (a>=b?a:b)
#define chmax(v,a) (v=v>=a?v:a)

int a[2][5001];

int main(){
	rd_init();
	int n=rd();
	int W=rd();
	int d=rd();
	rep(t,2){
		reps(i,1,W+1){
			a[t][i]=-(1<<30);
		}
	}
	while(n--){
		int t=*rp&1; rp+=2;
		int w=rd();
		int v=rd();
		rrep(i,W+1-w){
			chmax(a[t][i+w],a[t][i]+v);
		}
	}
	int z=0;
	rep(i,W+1){
		int s=max(0,i-d);
		int e=min(W-i,i+d)+1;
		reps(j,s,e){
			chmax(z,a[0][i]+a[1][j]);
		}
	}
	wt1(z);
	_exit(0);
}