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package acmicpc;
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.util.Arrays;
public class acmicpc25304 {
public static void main(String[] agrs) {
try {
BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));
BufferedWriter writer = new BufferedWriter(new OutputStreamWriter(System.out));
int x = Integer.parseInt(reader.readLine());
int n = Integer.parseInt(reader.readLine());
int sum = 0;
for(int i=0; i<n; i++) {
int[] intArr = Arrays.stream(reader.readLine().split(" ")).mapToInt(Integer::parseInt).toArray();
sum = sum + intArr[0] * intArr[1];
}
writer.append(sum == x ? "Yes" : "No");
writer.flush();
writer.close();
} catch (Exception e) {
}
}
}