package no448a;

import java.io.IOException;
import java.io.InputStream;
import java.io.PrintWriter;
import java.util.Arrays;
import java.util.InputMismatchException;
import java.util.NoSuchElementException;

public class Main {
	public static long INF = 1L << 60;
	public static void main(String[] args) {
//		for(int i=0;i<1000;i++) {
//			test();
//		}
		IO io = new IO();
		int n = io.nextInt();
		int k = io.nextInt();
		long[] t = new long[n+1];
		long[] d = new long[n+1];
		for(int i=0;i<n;i++) {
			t[i] = io.nextLong();
			d[i] = io.nextLong();
		}
		t[n] = INF;
		for(long l: solve(n,k,t,d)) {
			System.out.println(l);
		}
	}
	
	public static long[] solve(int n,int k,long[] t,long[] d) {
		RangeMaximumQuery rmq = new RangeMaximumQuery(n+1);
		for(int i=0;i<=n;i++) {
			rmq.set(i, d[i]);
		}
		long[] dsum = new long[n+2];
		for(int i=0;i<=n;i++) {
			dsum[i+1] = dsum[i] + d[i];
		}
		int[] next = new int[n];
		for(int i=0;i<n;i++) {
			next[i] = Arrays.binarySearch(t, t[i] + k);
		}
		
		long left = -1;
		long right = 1000000000;
		while(left + 1 < right) {
			long c = (left + right) / 2; //大丈夫?
//			System.out.println(c);
			
			long ans = method(n, k, t, d, rmq, dsum, c, next);
			if (ans < INF) {
				right = c;
			}else{
				left = c;
			}
		}
		return new long[] {right , method(n, k, t, d, rmq, dsum, right, next)};
	}

	public static int NMAX = 200000;
	public static long[] dp = new long[NMAX+1];
	private static long method(int n, int k, long[] t, long[] d, RangeMaximumQuery rmq, long[] dsum, long c, int[] next) {
		Arrays.fill(dp, INF);
		dp[0] = 0;
		for(int i=0;i<n;i++) {
//				System.out.println(dpmax[i] + "," + dpsum[i]);
			//やる
			if (d[i] <= c) {
				long sum = dp[i] + d[i];
//					System.out.println((i+1) + ":" + max + "," + sum);
				if (sum < dp[i+1]) {
					dp[i+1] = sum;
				}
			}
			//投げる
			int idx = next[i];
			if (idx < 0) idx = ~idx;
			//[i+1,idx)
			long maxdiff = rmq.max(i+1, idx);
			if (maxdiff <= c) {
				long sum2 = dp[i];
				if (i+1 <= idx) {
					sum2 += dsum[idx] - dsum[i+1];
				}
//					System.out.println((idx) + ":" + max2 + "," + sum2);
				if (sum2 < dp[idx]) {
					dp[idx] = sum2;
				}
			}
		}
		return dp[n];
	}	

}
/* 0-indexed */
class BIT {
	private int n;
	private long[] bit;
	public BIT(int n) {
		this.n = n;
		bit = new long[n+1];
	}

	public void accumulate(int index,long num) {
		index++;
		while(index<=n) {
			bit[index] += num;
			index+=index&-index;
		}
	}

	/* [begin , end) */
	public long sum(int begin,int end) {
		return sum(end) - sum(begin);
	}

	private long sum(int i) {
		long s = 0;
		while(i>0) {
			s+=bit[i];
			i-=i&-i;
		}
		return s;
	}

	public long get(int index) {
		return sum(index,index+1);
	}

	public void set(int index,long num) {
		accumulate(index,num-get(index));
	}

	public String toString() {
		long[] value = new long[n];
		for(int i=0;i<n;i++) {
			value[i] = get(i);
		}
		return Arrays.toString(value);
	}
}

class RangeMaximumQuery {
	public static final long INF = (1L<<60);
	private int size,n = 1;
	private long[] data;
	public RangeMaximumQuery(int size) {
		this.size = size;
		while(this.n<this.size) {
			this.n*=2;
		}
		data = new long[n*2-1];
		this.init();
	}

	private void init() {
		Arrays.fill(data, -INF);
	}

	public void set(int i,long x) {
		i+=n-1;
		data[i] = x;
		while(i>0) {
			i=(i-1)/2;
			data[i] = Math.max(data[i*2+1],data[i*2+2]);
		}
	}

	public long get(int i) {
		return data[i+n-1];
	}

	public long max(long begin,long end) {
		return query(begin,end,0,0,n);
	}

	private long query(long a,long b,int k,int l,int r) {
		if (r<=a || b<=l) {
			return -INF;
		}
		if (a<=l && r<=b) {
			return data[k];
		}else{
			return Math.max(query(a,b,k*2+1,l,(l+r)/2),query(a,b,k*2+2,(l+r)/2,r));
		}
	}

	public String toString() {
		return Arrays.toString(Arrays.copyOfRange(data, n-1, size+n-1));
	}
}

class IO extends PrintWriter {
	private final InputStream in;
	private final byte[] buffer = new byte[1024];
	private int ptr = 0;
	private int buflen = 0;
	
	public IO() { this(System.in);}
	public IO(InputStream source) { super(System.out); this.in = source;}
	private boolean hasNextByte() {
		if (ptr < buflen) {
			return true;
		}else{
			ptr = 0;
			try {
				buflen = in.read(buffer);
			} catch (IOException e) {
				e.printStackTrace();
			}
			if (buflen <= 0) {
				return false;
			}
		}
		return true;
	}
	private int readByte() { if (hasNextByte()) return buffer[ptr++]; else return -1;}
	private static boolean isPrintableChar(int c) { return 33 <= c && c <= 126;}
	private static boolean isNewLine(int c) { return c == '\n' || c == '\r';}
	public boolean hasNext() { while(hasNextByte() && !isPrintableChar(buffer[ptr])) ptr++; return hasNextByte();}
	public boolean hasNextLine() { while(hasNextByte() && isNewLine(buffer[ptr])) ptr++; return hasNextByte();}
	public String next() {
		if (!hasNext()) {
			throw new NoSuchElementException();
		}
		StringBuilder sb = new StringBuilder();
		int b = readByte();
		while(isPrintableChar(b)) {
			sb.appendCodePoint(b);
			b = readByte();
		}
		return sb.toString();
	}
	public char[] nextCharArray(int len) {
		if (!hasNext()) {
			throw new NoSuchElementException();
		}
		char[] s = new char[len];
		int i = 0;
		int b = readByte();
		while(isPrintableChar(b)) {
			if (i == len) {
				throw new InputMismatchException();
			}
			s[i++] = (char) b;
			b = readByte();
		}
		return s;
	}
	public String nextLine() {
		if (!hasNextLine()) {
			throw new NoSuchElementException();
		}
		StringBuilder sb = new StringBuilder();
		int b = readByte();
		while(!isNewLine(b)) {
			sb.appendCodePoint(b);
			b = readByte();
		}
		return sb.toString();
	}
	public long nextLong() {
		if (!hasNext()) {
			throw new NoSuchElementException();
		}
		long n = 0;
		boolean minus = false;
		int b = readByte();
		if (b == '-') {
			minus = true;
			b = readByte();
		}
		if (b < '0' || '9' < b) {
			throw new NumberFormatException();
		}
		while(true){
			if ('0' <= b && b <= '9') {
				n *= 10;
				n += b - '0';
			}else if(b == -1 || !isPrintableChar(b)){
				return minus ? -n : n;
			}else{
				throw new NumberFormatException();
			}
			b = readByte();
		}
	}
	public int nextInt() {
		long nl = nextLong();
		if (nl < Integer.MIN_VALUE || nl > Integer.MAX_VALUE) {
			throw new NumberFormatException();
		}
		return (int) nl;
	}
	public char nextChar() {
		if (!hasNext()) {
			throw new NoSuchElementException();
		}
		return (char) readByte();
	}
	public double nextDouble() { return Double.parseDouble(next());}
	public int[] nextIntArray(int n) { int[] a = new int[n]; for(int i=0;i<n;i++) a[i] = nextInt(); return a;}
	public long[] nextLongArray(int n) { long[] a = new long[n]; for(int i=0;i<n;i++) a[i] = nextLong(); return a;}
	public double[] nextDoubleArray(int n) { double[] a = new double[n]; for(int i=0;i<n;i++) a[i] = nextDouble(); return a;}
	public void nextIntArrays(int[]... a) { for(int i=0;i<a[0].length;i++) for(int j=0;j<a.length;j++) a[j][i] = nextInt();}
	public int[][] nextIntMatrix(int n,int m) { int[][] a = new int[n][]; for(int i=0;i<n;i++) a[i] = nextIntArray(m); return a;}
	public char[][] nextCharMap(int n,int m) { char[][] a = new char[n][]; for(int i=0;i<n;i++) a[i] = nextCharArray(m); return a;}
	public void close() { super.close(); try {in.close();} catch (IOException e) {}}
}