#include <math.h>

double f1(double x) { return x*x; }

double f2(double x) { return sqrt(x); }

static const int N=314;

int main() {
    int i,j,ii;
    double A[N][N];
    for (i=0; i<N; ++i)
        for (j=0; j<N; ++j)
            A[i][j] = i * 0.5 + j;

    for (ii=0; ii<10000; ++ii)
        for (i=0; i<N; ++i)
            for (j=0; j<N; ++j)
                A[i][j] = f2(f1(A[i][j]));

    return 0;
}