#include <bits/stdc++.h>
using namespace std;
#define fast() ios::sync_with_stdio(false); cin.tie(0); cout.tie(0);
#define all(x) (x).begin(),(x).end()
#define yesc cout << "YES\n"
#define noc cout << "NO\n"
#define yesp printf("YES\n")
#define nop printf("NO\n")
#define PI 3.141592653589793238462643383279502884L
typedef long long ll;
void solve() {
int n, m, r; cin >> n >> m >> r;
if(n>=r) {
yesc;
return;
}
if(n<=m) {
noc;
return;
}
int curr=0;
while(true) {
curr+=n;
if (curr>=r) break;
curr-=m;
}
yesc;
}
int main() {
fast();
int t=1;
//cin >> t;
while(t--)
solve();
return 0;
}
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