#include <numeric>
#include <vector>
#include <algorithm>
#include <cmath>
#include <cstdio>

int main()
{

    std::vector<float> fs(64*1024*1024,0);
    int i = 0;
    for(float& f : fs){
        f = float(i) / float(fs.size());
        i ++;
    }

    std::for_each(fs.begin(), fs.end(), [](float& f){f=std::sinf((f));});
    //std::for_each(fs.begin(), fs.end(), [](float& f){f=std::sin(double(f));});
    float x = std::accumulate(fs.begin(), fs.end(), 0.0);
    printf("%.4f\n", x);

}