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dpSms.cc
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dpSms.cc
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#include <iostream>
#include <vector>
unsigned getSmsCount(unsigned noPresses)
{
std::vector<unsigned> presses(noPresses+1, 0);
presses[0] = 1; // one empty message
unsigned result = 0;
for (unsigned i = 1; i < presses.size(); ++i) {
unsigned s = presses[i-1] * 8;
if (i >= 2) {
s += presses[i-2] * 8;
}
if (i >= 3) {
s += presses[i-3] * 8;
}
if (i >= 4) {
s += presses[i-4] * 2;
}
presses[i] = s;
result += s;
}
return result;
}
int main()
{
unsigned noPresses;
std::cin >> noPresses;
std::cout << getSmsCount(noPresses) << std::endl;
return 0;
}