//Copy all this code and paste it

include

// Recursive function to find the nth term of the series int recurse(int n, int a, int b, int c) { // Base cases if (n == 1) return a; if (n == 2) return b; if (n == 3) return c;

// Recursive case
return recurse(n-1, a, b, c) + recurse(n-2, a, b, c) + recurse(n-3, a, b, c);

}

int main() { int n, a, b, c;

// Input n and the first three terms of the series
scanf("%d", &n);
scanf("%d %d %d", &a, &b, &c);

// Output the nth term of the series
printf("%d\n", recurse(n, a, b, c));

return 0;

}