#include<stdio.h>
int main(){
    float initial_balance;
    int num_transaction;
    scanf("%f\n",&initial_balance);
    scanf("%d\n",&num_transaction);
    for(int i=0;i<num_transaction;i++){
        float transaction_amount;
        scanf("%f\n",&transaction_amount);
        initial_balance+=transaction_amount;
    }
    printf("%.2f\n",initial_amount);
    return 0;
}