C :

#include<stdio.h>
int x1,x2,x3,x4,x5,x6,sum=0;
short int flag[1001];
int main()
{
        scanf("%d%d%d%d%d%d",&x1,&x2,&x3,&x4,&x5,&x6);
        for(int i1=0;i1<=x1;i1++)
         for(int i2=0;i2<=x2;i2++)
          for(int i3=0;i3<=x3;i3++)
       		for(int i4=0;i4<=x4;i4++)
            for(int i5=0;i5<=x5;i5++)
             for(int i6=0;i6<=x6;i6++)
             	flag[i1+i2*2+i3*3+i4*5+i5*10+i6*20]++;
        for(int i=1;i<=1000;i++)
        {
        	if(flag[i]!=0)
        	{
        		sum++;
        	}
        }
        printf("%s%d","Total=",sum);
        return 0;
}

C++ :

#include <iostream>

using namespace std;

int main()
{
	long long a1,a2,a3,a4,a5,a6,sum=0;
	bool mass[1001]={false};

	cin>>a1>>a2>>a3>>a4>>a5>>a6;

	for (int i1=0;i1<=a1;i1++)
	  for (int i2=0;i2<=a2;i2++)
	    for (int i3=0;i3<=a3;i3++)
	      for (int i4=0;i4<=a4;i4++)
	        for (int i5=0;i5<=a5;i5++)
	          for (int i6=0;i6<=a6;i6++)
	            mass[i1+2*i2+3*i3+5*i4+10*i5+20*i6]=true;

	for(int i=1;i<=1000;i++)
		if (mass[i]==true)sum++;

	cout<<"Total="<<sum<<endl;

	return 0;
}