open System
type Sol() =
    member this.Solve() = 
        let L = stdin.ReadLine() |> int
        let M = stdin.ReadLine() |> int
        let N = stdin.ReadLine() |> int
        
        let ans = (N%25) + ( ((N/25)+M)%4 ) + ( L + ((N/25)+M)/4 ) % 10 
        ans |> printfn "%d"
        
        
let mySol = new Sol()
mySol.Solve()