N,K,X=map(int,input().split())
A=list(map(int,input().split()))

DP0=0
DP1=1<<60

for a in A:
    NDP0=min(DP0,DP1)+a
    NDP1=min(DP0+X+K,DP1+K)

    DP0=NDP0
    DP1=NDP1

print(min(DP0,DP1))