This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#include <bits/stdc++.h>
#include<unordered_map>
using namespace std;
#define ll long long
#define endl "\n"
#define Sara ios_base::sync_with_stdio(false);cin.tie(NULL);cout.tie(NULL);
const long long mod=1e9+7;
const double PI=acos(-1);
// 1 2 3 --> 1,2,3 ...1,2..1,3..1..2,3..2..3..none (2 power number of elements)
//1 2 3 --> 2--> 1,2..1,3..2,3..(!n/(r!(n-r)!)) aka:ncr
// 1 2 3 -->2-->1,2..2,1..1,3..3,1..2,3..3,2..(n!/(n-r)!) aka:npr
//1 2 3--> 1..1,2..1,2,3..2..2,3..3 number of subarrays -->(n*(n+1))/2 "sum of numbers from 1 to n."
/*
ll power(ll x,ll y)
{
if(y==0)
return 1;
else if(y==1)
return x%mod;
ll r=power(x%mod,((y%mod)/2)%mod);
if(y%2==0)
return ((r%mod)*(r%mod));
else
return ((r%mod)*(r%mod)*(x%mod));
}
ll inverse(ll md,ll x)
{
return power(x%mod,mod-2);
}
*/
ll n,k;
vector<pair<ll,ll>>v;
vector<ll>t;
ll dp[50][50];
ll solve(int id,int prev,ll sum)
{
if(id==n){
return 0;
}
if(dp[id][prev]!=-1) return dp[id][prev];
ll c1=0,c2=0;
if(v[prev].first<=v[id].first){
ll x=0;
if(sum+v[id].second>=k) x=1;
c1=solve(id+1,id,sum+v[id].second)+x;
}
c2=solve(id+1,prev,sum);
return dp[id][prev]=c1+c2;
}
int main()
{
//freopen("input.in","r",stdin);
Sara
cin>>n>>k;
v.resize(n+1);
memset(dp,-1,sizeof(dp));
for(int i=0;i<n;i++) cin>>v[i].first>>v[i].second;
v[n].first=0;v[n].second=0;
cout<<solve(0,n,0);
return 0;
}
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