#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
#define rep(i, n) for(ll i = 0, i##_len = (n); i < i##_len; i++)
#define reps(i, s, n) for(ll i = (s), i##_len = (n); i < i##_len; i++)
#define rrep(i, n) for(ll i = (n) - 1; i >= 0; i--)
#define rreps(i, e, n) for(ll i = (n) - 1; i >= (e); i--)
#define all(x) (x).begin(), (x).end()
#define rall(x) (x).rbegin(), (x).rend()
#define sz(x) ((ll)(x).size())
#define len(x) ((ll)(x).length())
#define endl "\n"
template<class T> void chmax(T &a, const T b){ a = max(a, b); }
template<class T> void chmin(T &a, const T b){ a = min(a, b); }
long long gcd(long long a, long long b) { return (a % b) ? gcd(b, a % b) : b; }
long long lcm(long long a, long long b) { return a / gcd(a, b) * b; }

int main() {
    cin.tie(0);
    ios::sync_with_stdio(false);
    // ifstream in("input.txt");
    // cin.rdbuf(in.rdbuf());
    ll x, y, z;
    cin >> x >> y >> z;
    cout << (y * z - 1) / x << endl;
    return 0;
}

#include <bits/stdc++.h>
#define IOS ios::sync_with_stdio(0),cin.tie(0),cout.tie(0) 
#define X first
#define Y second 
#define nl '\n'
#define AC return 0
#define pb(a) push_back(a) 
#define mst(a,b) memset(a, b, sizeof a)
#define rep(i,n) for(int i = 0; (i)<(n); i++)
#define rep1(i,n) for(int i = 1; (i)<=(n); i++)
#define scd(a) scanf("%lld", &a)
#define scdd(a,b) scanf("%lld%lld", &a, &b)
#define scs(s) scanf("%s", s)
//#pragma GCC optimize(2)
using namespace std;
typedef long long ll;
typedef unsigned long long ull;
typedef pair <int, int> pii;
typedef pair <ll, ll> pll;
const ll INF = (ll)0x3f3f3f3f3f3f3f, MAX = 9e18, MIN = -9e18;
const int N = 1e6+10, M = 2e6+10, mod = 1e9+7, inf = 0x3f3f3f;
ll a, b; 


int main()
{
	IOS;
	ll n, m, t, pre = 0;
	cin>>n>>m>>t;
	ll now = n;
	bool ok = 1;
	rep1(i, m)
	{
		cin>>a>>b;
		now -= a-pre;
		if(now <= 0)
		{
			ok = 0;
			break;
		}
		now = min(n, now+b-a);
		pre = b;
	}
	now -= t-pre;
	if(now <= 0)
		ok = 0;
	if(ok)
		puts("Yes");
	else
		puts("No");
	AC;
} 