What will be the output of the following C++ code?

#include <iostream>
#include <functional>
#include <numeric> 
using namespace std;
int myaccumulator (int x, int y) 
{
    return x - y;
}
int myproduct (int x, int y) 
{
    return x + y;
}
int main () 
{
    int a = 100;
    int series1[] = {10, 20, 30};
    int series2[] = {1, 2, 3};
    cout << inner_product(series1, series1 + 3, series2, a ,myaccumulator, 
    myproduct);
    cout << endl;
    return 0;
}