#include <iostream>
using namespace std;
void main(void)
{
    int cow=1, year=1,addCow=0,dieCow[15],countCow[21]={0,2,3,4};
    for(int i=0;i<15;i++) //初始化每年死的母牛；
  dieCow[i]=0;
    for(int j=4;j<=20;j++) //初始化第几年的母牛总数；
  countCow[i]=0;
    for(year=4;year<=20;year++)
    {
  if(year<16)
      countCow[year]=countCow[year-3]+countCow[year-1];
  else
      countCow[year]=countCow[year-3]+countCow[year-1]-countCow[year-15];
    }
    for(int k=1;k<=20;k++)
    {
  if(k<16)
      cout<<"第"<<k<<"年死去的母牛数为:"<<dieCow[k]<<";";
  else
      cout<<"第"<<k<<"年死去的母牛数为:"<<countCow[k-15]<<";";
  cout<<"第"<<k<<"年的母牛总数为："<<countCow[k]<<endl;
    }
}