#include <bits/stdc++.h> 
using namespace std;
 int main() {  
    int totalMedicine, numPatients;  
    cin >> totalMedicine;  
    cin >> numPatients;  
  
    vector<int> patientNeeds(numPatients);  
    for (int i = 0; i < numPatients; ++i) {  
        cin >> patientNeeds[i];  
    }  
  
    int unsatisfiedPatients = 0;  
    for (int i = 0; i < numPatients; ++i) {  
        if (patientNeeds[i] > totalMedicine) {  
            unsatisfiedPatients++;  
        } else {  
            totalMedicine -= patientNeeds[i];  
        }  
  
        // 如果药品已经发完，后面的病人自然也无法取药  
        if (totalMedicine <= 0) {  
            break;  
        }  
    }  
  
    cout << unsatisfiedPatients << endl;  
  
    return 0;  
}