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#include <iostream>
#include <limits>
#include <vector>
#include <array>

using Number = unsigned long;

int main()
{
  std::ios_base::sync_with_stdio(false);
  std::cin.tie(nullptr);

  Number spieciesCount{0};
  std::cin >> spieciesCount;
  Number mowingCount{0};
  std::cin >> mowingCount;

  const auto N = 500000;
  Number spieces[N];
  Number lawnHeight[N];
  //std::array<Number, N> spieces;
  //std::array<Number, N> lawnHeight;
//  std::vector<Number> spieces(spieciesCount, 0);
 // std::vector<Number> lawnHeight(spieciesCount, 0);
  std::vector<Number> mowns(mowingCount, 0);
  for (Number i = 0U; i < spieciesCount; ++i)
  {
    std::cin >> spieces[i];
    lawnHeight[i] = 0;
  }
  Number previousDay{0};
  Number day{0};
  Number cutHeight{0};
  Number dayDifference{0};
  Number mownWeight{0};
  for (auto & mown : mowns)
  {
    std::cin >> day;
    std::cin >> cutHeight;
    dayDifference = day - previousDay;
//      std::cerr << "\n";
//      std::cerr << "\n";
//      std::cerr << "\n";
//      std::cerr << "Dzien :" << day << "\n";
    mownWeight = 0;
    for (Number i = 0U; i < spieciesCount; ++i)
    {
//      std::cerr << "old w :" << lawnHeight[i] << "\n";
      lawnHeight[i] += dayDifference * spieces[i];
//      std::cerr << "new w :" << actualHeight << "\n";
//      std::cerr << "cut to:" << cutHeight << "\n";
      if (lawnHeight[i] > cutHeight)
      {
        mownWeight += lawnHeight[i] - cutHeight;
        lawnHeight[i] = cutHeight;
//      std::cerr << "cutted:" << actualHeight << "\n";
      }
//      std::cerr << "after :" << lawnHeight[i] << "\n";
    }
    previousDay = day;
    mown = mownWeight;
  }
  std::string out;
  for (auto & mown : mowns)
  {
    out += std::to_string(mown) + "\n";
  }
  std::cout << out;
}