#include<stdio.h>
int main()
{
    float balance;
    int n;
    scanf("%f", &balance);
    scanf("%d", &n);
    for (int i=0;i<n;i++)
    {
        float transaction;
        scanf("%f",&transaction);
        balance +=t transaction;
    }
    print("%.2f\n",balance);
    return 0;
}