Uva 1709

#include <stdio.h>
#include <string.h>
#include<math.h>

int main() {
    int p, a, b, c, d, n;
    while (scanf("%d %d %d %d %d", &p, &a, &b, &c, &d) == 5) {
        scanf("%d", &n);
        double max_decline = 0;
        double max = p * (sin((a + b)) + cos((c + d)) + 2);
        for (int k = 2; k <= n; k++) {
            double curr = p * (sin((a * k + b)) + cos((c * k + d)) + 2);
                if (max > curr) {
                    if(max_decline< max - curr){
                        max_decline=max-curr;
                    }
                } else {
                    max = curr;
                }
        }
        printf("%.8lf\n", max_decline);
    }
    return 0;
}