#include <iostream>
using namespace std;

int main() {
	ios::sync_with_stdio(0);
	cin.tie(0);
	
	int n, m, t;
	cin >> n >> m >> t;
	int start = 0, power = n;
	bool was = false;
	for(int i = 0; i < m; i++){
		int a, b;
		cin >> a >> b;
		power -= (a - start);
		if(power <= 0){
			was = true;
			break;
		}
		start = b;
		power += (b - a);
		if(power > n){
			power = n;
		}
	}
	power -= t - start;
	if(was || power <= 0){
		cout << "No";
	}
	else{
		cout << "Yes";
	}
	return 0;
}

#include<bits/stdc++.h>

using namespace std;

#define fRead(x)        freopen(x,"r",stdin)
#define fWrite(x)       freopen (x,"w",stdout)

#define LL              long long
#define ULL             unsigned long long
#define ff              first
#define ss              second
#define pb              push_back
#define PI              acos(-1.0)
#define mk              make_pair
#define pii             pair<int,int>
#define pll             pair<LL,LL>


#define min3(a,b,c)     min(a,min(b,c))
#define max3(a,b,c)     max(a,max(b,c))
#define min4(a,b,c,d)   min(a,min(b,min(c,d)))
#define max4(a,b,c,d)   max(a,max(b,max(c,d)))
#define SQR(a)          ((a)*(a))
#define FOR(i,a,b)      for(int i=a;i<=b;i++)
#define ROF(i,a,b)      for(int i=a;i>=b;i--)
#define REP(i,b)        for(int i=0;i<b;i++)
#define MEM(a,x)        memset(a,x,sizeof(a))
#define ABS(x)          ((x)<0?-(x):(x))

#define SORT(v)         sort(v.begin(),v.end())
#define REV(v)          reverse(v.begin(),v.end())
//#pragma GCC target ("avx2")
//#pragma GCC optimization ("O3")
//#pragma GCC optimization ("unroll-loops")
//#pragma comment(linker, "/stack:200000000")
//#pragma GCC optimize("Ofast")
//#pragma GCC target("sse,sse2,sse3,ssse3,sse4,popcnt,abm,mmx,avx,tune=native")
#define FastRead        ios_base::sync_with_stdio(0);cin.tie(nullptr);
#ifdef VAMP
     #define debug(...) __f(#__VA_ARGS__, __VA_ARGS__)
    template < typename Arg1 >
    void __f(const char* name, Arg1&& arg1){
        cout << name << " = " << arg1 << std::endl;
    }
    template < typename Arg1, typename... Args>
    void __f(const char* names, Arg1&& arg1, Args&&... args){
        const char* comma = strchr(names+1, ',');
        cout.write(names, comma - names) << " = " << arg1 <<" | ";
        __f(comma+1, args...);
    }
#else
    #define debug(...)
#endif

const int N = 2005;
int n , m , t;
int A[N],B[N];
int main()
{
    #ifdef VAMP
        clock_t tStart = clock();
        freopen("input.txt", "r", stdin);
        freopen("output.txt", "w", stdout);
    #endif
    cin >> n >> m >> t;
    int pre = 0;
    int charge = n;
    for(int i = 1;i <= m;i++){
        cin >> A[i] >> B[i];
        int dif = B[i] - A[i];
        int loss = A[i] - pre;
        charge = charge - loss;
        if(charge <= 0){
            cout << "No\n";
            return 0;
        }
        charge += dif;
        charge = min(charge,n);
        pre = B[i];
    }

    int loss = t - pre;
    charge = charge - loss;
    if(charge <= 0){
        cout << "No\n";
    }else{
        cout << "Yes\n";
    }

    #ifdef VAMP
        fprintf(stderr, "\n>> Runtime: %.10fs\n", (double) (clock() - tStart) / CLOCKS_PER_SEC);
    #endif
}
