C :

#include<stdio.h>
int main()
{
	int a,b,c;
	scanf("%d%d%d",&a,&b,&c);
	printf("%.1f",c-(a+b)*0.9);
	return 0;
}

C++ :

#include<iostream>
#include <iomanip>
using namespace std;
int main(){
	int n,x,y;
	cin>>x>>y>>n;
	cout<<fixed<<setprecision(1)<<(n-(x+y)*0.9);
} 

Java :

import java.util.Scanner;

public class Main {
	 
    /**
     * @param args
     */
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int a = sc.nextInt();
		int b = sc.nextInt();
		int c = sc.nextInt();
		double get = (double)(c - (a+b)*0.9);
		System.out.print( String.format("%.1f", get));
		
	}
	public static void printArr(int [] a){
		for (int i = 0 ;i<= a.length - 1 ;i++) {
			System.out.print( a[i] + " ");
		}
	}
}

Python :

s = input().split()
x = int(s[0])
y = int(s[1])
n = int(s[2])
a = (x + y) * 0.9
print(n - a)