I NEED A OFFER! HDU - 1203

#include<bits/stdc++.h>
using  namespace std;
const int N=1e4+7;
int weight[N];
double value[N];
double  dp[N];
int main(){
    int n,m;
    while(cin>>m>>n){
        if(n==0&&m==0) break;
        for(int i=1;i<=n;i++) {
            scanf("%d%lf",&weight[i],&value[i]);
            value[i]=1-value[i];
        }
        for(int i=0;i<=m;i++) dp[i]=1.0;
        
        for(int i=1;i<=n;i++){
            
            for(int j=m;j>=weight[i];j--){
                
                dp[j]=min(dp[j],dp[j-weight[i]]*value[i]);
                
            }
            
        }  
        
        printf("%.1lf",(1-dp[m])*100);
        cout<<"%"<<endl; 
    }
    return 0;
}