import * as fs from 'fs';

function main(input: Array<string>) {
    const n = Number(input[0]);
    const block_length_list = input[1].split(' ').map(x => Number(x));
    
    let head = block_length_list[0];
    const min_length = 1;
    let counter = 0;
    
    while(head != min_length) {
        swap(0, block_length_list.indexOf(head - 1), block_length_list);
        head = block_length_list[0];
        counter++;
    }
    
    console.log(counter);
}

function swap(origin, target, list) {
    const tmp = list[origin];
    list[origin] = list[target];
    list[target] = tmp;
}

main(fs.readFileSync('/dev/stdin', 'utf8').split('\n'));