import bisect,collections,copy,heapq,itertools,math,string,sys,queue
from decimal import Decimal
def I(): return input()
def IS(): return input().split()
def II(): return int(input())
def IIS(): return map(int,input().split())
def LIIS(): return list(map(int,input().split()))
def ZER(N): return [False for _ in range(N)]
INF=float("inf")
MOD=10**9+7
#　　　　　V
#　　 ／￣ψ￣＼
#　　| 合格祈願 |
#　　|＿＿＿＿＿|
##############################################################################
a,b,c,d,e=IIS()
com=b-c
ans=0
li=[]
for i in range(com):
    if i==0:li.append(d);continue
    i-=1
    if li[i]%10!=0:li.append(li[i]);continue
    elif li[i]%10==0 and e<=li[i]:li.append(x-e);continue
    else:li.append(li[i]);continue
print(sum(li))