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

int assess(int A, int B, int X, int Y) {
    // insert your code here
    return 42;
}


int main() {
    FILE *fr, *fw;
    int A, B, X, Y;

    fr = fopen("input.txt", "r");
    fw = fopen("output.txt", "w");
    assert(4 == fscanf(fr, "%d %d %d %d", &A, &B, &X, &Y));

    fprintf(fw, "%d\n", assess(A, B, X, Y));
    fclose(fr);
    fclose(fw);
    return 0;
}