#include <iostream>
#include <cstdio>
#include <cstdlib>
#include <string>
#include <cmath>
#include <map>

using namespace std; 

int counter(int s, int t, string weekday, string time, int m, int begin)
{
	map<string,int> week;
	map<string,int>::iterator ite;
	//week["All"] = 0;
	week["Sun"] = 0;
	week["Mon"] = 1440;
	week["Tue"] = 2880;
	week["Wed"] = 4320;
	week["Thu"] = 5760;
	week["Fri"] = 7200;
	week["Sat"] = 8640;

	int count = 0;
	int start = begin;
	int mid;
	int end;

	for(int i=start, j=0; j < m; i+=t,j++){
		i=i%10080; mid=(i+(s/2))%10080; end=(i+s)%10080;
		if(weekday=="All"){
			if(time == "Day"){
				for(ite = week.begin(); ite != week.end(); ++ite){
					if( (((week[ite->first]+(60*6)) <= i)&&((week[ite->first]+(60*18)) > i))&&
							(((week[ite->first]+(60*6)) <= mid)&&((week[ite->first]+(60*18)) > mid))&&
							(((week[ite->first]+(60*6)) <= end)&&((week[ite->first]+(60*18)) > end)) ){count++;break;}
				}
			}
			else if(time == "Night"){
				for(ite = week.begin(); ite != week.end(); ++ite){
					if(ite->first == "Sun"){
						if( (((week[ite->first] <= i)&&((week[ite->first]+(60*6)) > i))||((week["Sat"]+(60*18) <= i)&&((week["Sat"]+(60*24)) > i)) )&&
								(((week[ite->first] <= mid)&&((week[ite->first]+(60*6)) > mid))||((week["Sat"]+(60*18) <= mid)&&((week["Sat"]+(60*24)) > mid))) &&
								(((week[ite->first] <= end)&&((week[ite->first]+(60*6)) > end))||((week["Sat"]+(60*18) <= end)&&((week["Sat"]+(60*24)) > end))) ){count++;break;}
						else if( (((week[ite->first]+(60*18)) <= i)&&((week[ite->first]+(60*30)) > i))&&
										(((week[ite->first]+(60*18)) <= mid)&&((week[ite->first]+(60*30)) > mid))&&
										(((week[ite->first]+(60*18)) <= end)&&((week[ite->first]+(60*30)) > end)) ){count++;break;}
					}
					if(ite->first == "Sat"){
						if( ((week[ite->first]-(60*6) <= i)&&((week[ite->first]+(60*6)) > i))&&
								((week[ite->first]-(60*6) <= mid)&&((week[ite->first]+(60*6)) > mid))&&
								((week[ite->first]-(60*6) <= end)&&((week[ite->first]+(60*6)) > end)) ){count++;break;}
						else if( ((((week[ite->first]+(60*18)) <= i)&&((week[ite->first]+(60*24)) > i))||((week["Sun"] <= i)&&((week["Sun"]+(60*6)) > i)) )&&
										((((week[ite->first]+(60*18)) <= mid)&&((week[ite->first]+(60*24)) > mid))||((week["Sun"] <= mid)&&((week["Sun"]+(60*6)) > mid)) )&&
										((((week[ite->first]+(60*18)) <= end)&&((week[ite->first]+(60*24)) > end))||((week["Sun"] <= end)&&((week["Sun"]+(60*6)) > end))) ){count++;break;}
					}
					else{
						if( ((week[ite->first]-(60*6) <= i)&&((week[ite->first]+(60*6)) > i))&&
								((week[ite->first]-(60*6) <= mid)&&((week[ite->first]+(60*6)) > mid))&&
								((week[ite->first]-(60*6) <= end)&&((week[ite->first]+(60*6)) > end)) ){count++;break;}
						else if( (((week[ite->first]+(60*18)) <= i)&&((week[ite->first]+(60*30)) > i))&&
										(((week[ite->first]+(60*18)) <= mid)&&((week[ite->first]+(60*30)) > mid))&&
										(((week[ite->first]+(60*18)) <= end)&&((week[ite->first]+(60*30)) > end)) ){count++;break;}
					}
				}
			}
			else{ count++;}
		}
		else{
			if(time == "Day"){
				if( (((week[weekday]+(60*6)) <= i)&&((week[weekday]+(60*18)) > i))&&
						(((week[weekday]+(60*6)) <= mid)&&((week[weekday]+(60*18)) > mid))&&
						(((week[weekday]+(60*6)) <= end)&&((week[weekday]+(60*18)) > end)) ){count++;}
			}
			else if(time == "Night"){
				if( ((week[weekday] <= i)&&((week[weekday]+(60*6)) > i))&&
						((week[weekday] <= mid)&&((week[weekday]+(60*6)) > mid))&&
						((week[weekday] <= end)&&((week[weekday]+(60*6)) > end)) ){count++;}
				else if( (((week[weekday]+(60*18)) <= i)&&((week[weekday]+(60*24)) > i))&&
								(((week[weekday]+(60*18)) <= mid)&&((week[weekday]+(60*24)) > mid))&&
								(((week[weekday]+(60*18)) <= end)&&((week[weekday]+(60*24)) > end)) ){count++;}
			}
			else{
				if( ((week[weekday] <= i)&&((week[weekday]+(60*24)) > i))&&
						((week[weekday] <= mid)&&((week[weekday]+(60*24)) > mid))&&
						((week[weekday] <= end)&&((week[weekday]+(60*24)) > end)) ){count++;}
			}
		}
	}

	return count;
}

int main()
{
	int s, n, t, p, m;
	string weekday, time;

	while(cin >> s >> n >> t >> weekday >> time >> p >> m ){
		if((s==0)&&(n==0)&&(t==0)&&(weekday=="None")&&(time=="None")&&(p==0)&&(m==0)){return 0;}
		int count;
		int max = 0;

		for(int i=0; i<10080; i++){
			count = counter(s, t, weekday, time, m, i);
			if(max<count){ max=count;}
		}

		printf("%1.10f\n", 1.0 - pow((double)(p-1)/p, n*max) );		
	}
	
}

Measured memory_bytes: 1288