class chap4_pi { 
public static void main(String[] args) { 
double i,x,a,cpt; 
cpt=100000000; 
a=1; 
for(i=2;i<=cpt;i++) { 
a=a+1/(i*i); 
} 
a=a*6; 
x=1; 
cpt=10; 
while(x*x x++; 
} 
if(x*x!=a) { 
x-; 
for(i=1;i<=cpt;i++) { 
x=0.5*(x+(a/x)); 
} 
} 
System.out.println(x); 
} 
}
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