#include <stdio.h>

int main(){
    int cost;
    int last = 0;
    int sum = 0;
    for ( int i=0;i<12;i++ ){
        scanf("%d",&cost);
        int unused = 300+last-cost;
        if ( unused<0 ){
            printf("%d",-(i+1));
            return 1;
        }
        int moon = (unused/100)*100;
        sum += moon;
        last = 300-moon-cost+last;
    }
    float year = sum*1.2;
    printf("%g",year+last);
    return 0;
}

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