#include <stdio.h>
#include <utility>
#include <algorithm>
#include <functional> // std::greater
#include <vector>
#include <cmath>
std::vector< std::pair<int,int> > N;
int M;
template < template <typename> class P = std::greater >
struct compare_pair_second {
template<class T1, class T2> bool operator()(const std::pair<T1,T2>&left, const std::pair<T1,T2>&right) {
return P<T2>()(left.second, right.second);
}
};
int main(){
int i,j, n, m;
scanf("%d %d ", &n, &m);
for(i=0; i < n; ++i){
int nx, ny;
scanf("%d %d ", &nx, &ny);
N.push_back( std::pair<int,int>(nx, ny) );
}
std::sort( N.begin(), N.end(), compare_pair_second<std::greater>() );
for(i=0; i < m; ++i){
scanf("%d", &M);
double rad=0.0;
for(j=0; j < n; ++j){
if( N[j].first > M ){
double dw = N[j].first-M;
double ds = sqrt((dw*dw)+((N[j].second)*(N[j].second)));
double _r = asin(N[j].second/ds);
if( _r > rad ) rad = _r;
} else if( n >= 5 && j > n/2 ) break;
}
printf("%.7f\n", rad);
}
return 0;
}
