#include <iostream>

int main() {
    int m; // 初始药品总量
    std::cin >> m;

    int n; // 取药的人数
    std::cin >> n;

    int remainingMedicine = m; // 当前剩余药品总量

    int patientsWithoutMedicine = 0; // 没有取上药品的病人数

    for (int i = 0; i < n; ++i) {
        int medicineNeeded;
        std::cin >> medicineNeeded;

        if (medicineNeeded <= remainingMedicine) {
            remainingMedicine -= medicineNeeded;
        } else {
            patientsWithoutMedicine++;
        }
    }

    std::cout << patientsWithoutMedicine << std::endl;

    return 0;
}