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