Неверно считывается условие

#include <iostream>
#include <cmath>
using namespace std;
void main ()
{float R=15,
xa[5]= {2,3,22,45,11},
ya[5]= {3,3,12,7,14},
xb[5]= {10,5,1,4,5},
yb[5]= {3,10,9,3,13},
xc[5]= {5,4,23,3,5},
yc[5]= {8,14,43,11,3},
xd[5]= {3,11,23,42,2},
yd[5]= {8,8,3,11,43},
    Sall=0,Summ=0,s1=0,s2=0, p1=0,p2=0,a,b,c,d,e;
int i;
for(i=0;i<5;i++)
{ 
if (xa[i]<R,xb[i]<R,xc[i]<R,xd[i]<R,ya[i]<R,yb[i]<R,yc[i]<R,yd[i]<R) 
{
a=sqrt(pow((xd[i]-xc[i]),2)+pow((yd[i]-yc[i]),2));
b=sqrt(pow((xc[i]-xb[i]),2)+pow((yc[i]-yb[i]),2));
c=sqrt(pow((xd[i]-xb[i]),2)+pow((yd[i]-yb[i]),2));
d=sqrt(pow((xb[i]-xa[i]),2)+pow((yb[i]-ya[i]),2));
e=sqrt(pow((xd[i]-xa[i]),2)+pow((yd[i]-ya[i]),2));
p1=(a+b+c)/2;
s1=sqrt(p1*(p1-a)*(p1-b)*(p1-c));
p2=(c+d+e)/2;
s2=sqrt(p2*(p2-c)*(p2-d)*(p2-e));
Summ=s1+s2;
}
else {Summ=0;}
Sall += Summ;
 
cout<<Summ<<"    ";
}
cout<<Sall<<endl;
system ("pause");
}

else {Summ=0;}