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

bool tstSeq(FILE* f);
const double EPS = 0.0001;

int main() {
    FILE* in = fopen("input.txt", "r");
    if (in == NULL) {
        perror("Could not open input file");
        return (-1);
    }

    bool res = tstSeq(in);
    fclose(in);

    FILE* out = fopen("output.txt", "w");
    if (in == NULL) {
        perror("Could not open output file");
        return (-1);
    }

    if (res)
        fprintf(out, "true\n", res);
    else
        fprintf(out, "false\n", res);
    fclose(out);
    return 0;
}

bool tstSeq(FILE* f) {
    double c1, c2, c3, d;
    if (fscanf(f, "%lf%lf%lf%lf", &c1, &c2, &c3, &d) < 4) {
        fprintf(stderr, "Incorrect input file\n");
        exit(-1);
    }

    double x1 = 0., x2 = 0., x3 = 0.;
    bool res = true;
    int len = 0;
    int a;
    while (fscanf(f, "%d", &a) == 1) {
        x1 = x2; x2 = x3; x3 = a;
        ++len;
        if (len >= 3) {
            if (fabs(x1*c1 + x2*c2 + x3*c3 - d) >= EPS) {
                res = false; break;
            }
        }
    }
    return (res && len >= 3);
}