#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <assert.h>

#define LINE_SIZE 1024

int main() {
    char line[LINE_SIZE];
    char* endptr = NULL;
    char* start = NULL;

    memset(line, 0, LINE_SIZE);
    char* r1 = fgets(line, LINE_SIZE, stdin);
    assert(r1 != NULL);

    double x = strtod(line, NULL);

    memset(line, 0, LINE_SIZE);
    char* r2 = fgets(line, LINE_SIZE, stdin);
    assert(r2 != NULL);

    int len = strlen(line);
    start = line;

    double result = 0.0;
    int first = 1;

    while (start < (line + len)) {
        double val = strtod(start, &endptr);

        if (start != endptr) {
            if (first) {
                result = val;
                first = 0;
            } else {
                result = result * x + val;
            }
            start = endptr;
        } else {
            break;
        }
    }

    return 0;
}