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int decimalNumber = index+1;

int[] values = {1000,900,500,400,100,90,50,40,10,9,5,4,1};
String[] romanLetters = {"M","CM","D","CD","C","XC","L","XL","X","IX","V","IV","I"};

StringBuilder romanNumber = new StringBuilder();

for(int i=0; i<values.length; i++){  
    while(decimalNumber >= values[i]){
        decimalNumber = decimalNumber - values[i];
        romanNumber.append(romanLetters[i]);
    }
}

return romanNumber;