Determining the output of the structure size in the console

It is necessary to understand what result will be printed when the following program is run.

# include <cstdint>
# include <iostream>

# pragma pack(4)

struct A
{
    uint64_t Value1 = 10;
    uint32_t Value2 = 20;
    uint16_t Value3 = 30;
};

int main()
{
    std::cout << sizeof(A) << std::endl;
    return 0;
}