{"raw_statement":[{"iden":"problem statement","content":"We have $A$ cards, each of which has an integer $1$ written on it. Similarly, we also have $B$ cards with $0$s and $C$ cards with $-1$s.\nWe will pick up $K$ among these cards. What is the maximum possible sum of the numbers written on the cards chosen?"},{"iden":"constraints","content":"*   All values in input are integers.\n*   $0 \\leq A, B, C$\n*   $1 \\leq K \\leq A + B + C \\leq 2 \\times 10^9$"},{"iden":"input","content":"Input is given from Standard Input in the following format:\n\n$A$ $B$ $C$ $K$"},{"iden":"sample input 1","content":"2 1 1 3"},{"iden":"sample output 1","content":"2\n\nConsider picking up two cards with $1$s and one card with a $0$. In this case, the sum of the numbers written on the cards is $2$, which is the maximum possible value."},{"iden":"sample input 2","content":"1 2 3 4"},{"iden":"sample output 2","content":"0"},{"iden":"sample input 3","content":"2000000000 0 0 2000000000"},{"iden":"sample output 3","content":"2000000000"}],"translated_statement":null,"sample_group":[],"show_order":["default"],"formal_statement":null,"simple_statement":null,"has_page_source":true}